1 00:00:02,040 --> 00:00:04,040 (BELLS CHIME) 2 00:00:31,280 --> 00:00:33,590 (READS) 'I may not even answer at my trial 3 00:00:33,640 --> 00:00:37,550 and it seems to me that there is so much of this strength in me now 4 00:00:37,600 --> 00:00:41,110 that I shall vanquish everything, all of the suffering, 5 00:00:41,160 --> 00:00:45,870 only so that I may keep saying to myself constantly, "I am!" 6 00:00:45,920 --> 00:00:49,230 I may endure a thousand torments, yet I am. 7 00:00:49,280 --> 00:00:52,230 I may writhe under torture, but I am.' 8 00:00:52,280 --> 00:00:56,350 I may sit in a tower, but I exist. 9 00:00:56,400 --> 00:00:58,950 I can see the sun, 10 00:00:59,000 --> 00:01:02,750 but even if I cannot see the sun, I know that it exists. 11 00:01:02,800 --> 00:01:06,430 And to know that the sun is there... 12 00:01:06,480 --> 00:01:09,720 .. that is living. 13 00:01:45,320 --> 00:01:47,310 15. 14 00:01:47,360 --> 00:01:49,640 It must be my lucky night. 15 00:01:59,080 --> 00:02:01,080 My eyes are tired. 16 00:02:03,200 --> 00:02:07,230 Maybe I should get an audio book. They don't complain. 17 00:02:07,280 --> 00:02:09,310 They don't get your medication either. 18 00:02:09,360 --> 00:02:12,310 Or post your letters. Or see that you do your exercises. 19 00:02:12,360 --> 00:02:14,680 You do bang on, don't you? 20 00:02:51,840 --> 00:02:54,910 - Thanks for the lift. - It's not like it's out of my way. 21 00:02:54,960 --> 00:02:57,390 Still, it's a bit early for you to go in, isn't it? 22 00:02:57,440 --> 00:03:00,240 I like to pull my weight now and then. 23 00:03:08,600 --> 00:03:11,070 This is how the last one began. 24 00:03:44,160 --> 00:03:47,990 Call me, will you? I left early this morning. You were still asleep. 25 00:03:48,040 --> 00:03:51,160 - Just let me know you're OK. - Frank! 26 00:03:52,760 --> 00:03:55,230 - Pick-up in Wantage. - Again? 27 00:04:25,960 --> 00:04:27,960 Ladies. 28 00:04:32,240 --> 00:04:34,830 - Morning. Any mail for me? - Yes, Professor Capstone. 29 00:04:34,880 --> 00:04:36,750 - That's great. - There you are. 30 00:04:36,800 --> 00:04:38,630 - You've had your hair done? - Yes. 31 00:04:38,680 --> 00:04:40,880 - Very chic. - Thank you! 32 00:06:08,560 --> 00:06:11,500 Bomb disposal have given us the all clear. 33 00:06:26,720 --> 00:06:29,190 Major blast trauma to the head and torso. 34 00:06:29,240 --> 00:06:31,670 Severe lacerations from the shrapnel. 35 00:06:31,720 --> 00:06:34,030 Designed to kill, then, not just maim. 36 00:06:34,080 --> 00:06:36,230 Adam Capstone. 34. 37 00:06:36,280 --> 00:06:40,230 Currently Bridson-Whitereid Professor of Geometric Topology. 38 00:06:40,280 --> 00:06:43,710 Pure maths, rather than applied. And not to be confused with topography. 39 00:06:43,760 --> 00:06:45,550 As if. 40 00:06:45,600 --> 00:06:49,080 The secretary confirmed the parcel arrived in the post this morning. 41 00:06:58,640 --> 00:07:01,550 - Find out next of kin and get Family Liaison on to them. - OK. 42 00:07:01,600 --> 00:07:04,790 See if anyone was seen hanging around prior to the explosion. 43 00:07:04,840 --> 00:07:08,270 - Whoever did this might have stayed to admire their handiwork. - Sir. 44 00:07:08,320 --> 00:07:10,030 Excuse me. You have to let me -- 45 00:07:10,080 --> 00:07:11,990 Detective Inspector Lewis. Can I help? 46 00:07:12,040 --> 00:07:14,230 I work here. They said there was an accident. 47 00:07:14,280 --> 00:07:15,950 Would you like to move back, Mr...? 48 00:07:16,000 --> 00:07:18,310 Capstone. David Capstone. 49 00:07:18,360 --> 00:07:20,430 Are you related to Adam Capstone? 50 00:07:20,480 --> 00:07:22,400 He's my brother. 51 00:07:23,400 --> 00:07:26,070 Would you like to come with me, sir? 52 00:07:32,800 --> 00:07:35,870 How long have you and your brother worked here? 53 00:07:35,920 --> 00:07:39,150 Erm... we never really left. 54 00:07:39,200 --> 00:07:41,310 I got my double first at 17. 55 00:07:41,360 --> 00:07:43,510 Stayed on to do an MSc. 56 00:07:43,560 --> 00:07:45,670 And then I joined the staff. 57 00:07:45,720 --> 00:07:47,510 Adam was the same. 58 00:07:47,560 --> 00:07:50,230 Only he got his double first at 16. 59 00:07:50,360 --> 00:07:52,190 Two geniuses in one family. 60 00:07:52,240 --> 00:07:55,280 That's an over-used word but erm... 61 00:07:56,280 --> 00:07:58,150 We specialise in knot theory. 62 00:07:58,200 --> 00:08:00,350 Knots have their own theory? 63 00:08:00,400 --> 00:08:02,350 Yeah, there's some of them. 64 00:08:02,400 --> 00:08:06,120 But it's the ones in DNA that we're particularly interested in. 65 00:08:07,600 --> 00:08:09,990 If the human nucleus was the size of a basketball, 66 00:08:10,040 --> 00:08:12,190 do you know how long the DNA inside would be? 67 00:08:12,240 --> 00:08:14,360 150 miles. 68 00:08:15,360 --> 00:08:17,710 Sorry. It's what Adam tells his students. 69 00:08:17,760 --> 00:08:21,040 Erm... TOLD his students. 70 00:08:22,680 --> 00:08:27,710 Er... for the last few years, we've erm... 71 00:08:27,760 --> 00:08:30,590 If you can figure out how DNA coils up, how it's packed, 72 00:08:30,640 --> 00:08:32,550 then you can unpack it. 73 00:08:32,600 --> 00:08:35,470 Modify it. Repair it. That's what we've been trying to do. 74 00:08:35,520 --> 00:08:37,750 A team. 75 00:08:37,800 --> 00:08:41,670 Any idea who would want to attack you like this? 76 00:08:41,720 --> 00:08:45,910 Er... our research? If what we've discovered is correct, 77 00:08:45,960 --> 00:08:49,270 then we're talking about new ways to fight genetic diseases. Cancer. 78 00:08:49,320 --> 00:08:51,030 New hope. New life. 79 00:08:51,080 --> 00:08:52,910 Why would anyone want to stop that? 80 00:08:52,960 --> 00:08:55,230 Maybe it was more personal. 81 00:08:57,640 --> 00:08:59,640 Erm... 82 00:09:01,800 --> 00:09:04,270 .. these came. 83 00:09:04,320 --> 00:09:06,870 Adam wanted to get rid of them. Said it was a crank. 84 00:09:06,920 --> 00:09:08,950 That if we ignored them, they'd go away. 85 00:09:09,000 --> 00:09:11,070 Any idea who sent them? 86 00:09:13,560 --> 00:09:15,560 Mr Capstone? 87 00:09:16,560 --> 00:09:18,550 Erm... 88 00:09:18,600 --> 00:09:22,700 Well, there's someone. But I-I can't believe that she'd... 89 00:09:24,840 --> 00:09:26,830 Kate McMurdoch. 90 00:09:26,880 --> 00:09:28,670 And she is? 91 00:09:28,720 --> 00:09:30,470 She was one of our students. 92 00:09:30,520 --> 00:09:34,230 Got it in her head that she'd made some major discovery. 93 00:09:34,280 --> 00:09:36,270 Accused us of stealing her research. 94 00:09:36,320 --> 00:09:38,510 - And had you? - No. God, no. 95 00:09:38,560 --> 00:09:41,720 It's an inflated sense of her own importance, I'm afraid. 96 00:09:42,720 --> 00:09:44,590 We had to let her go and... 97 00:09:44,640 --> 00:09:46,480 she wasn't happy. 98 00:10:05,960 --> 00:10:09,710 Open day at the allotments. Said I'd help on the cake stall. 99 00:10:09,760 --> 00:10:12,700 - You haven't got time. - I'll make time. 100 00:10:12,960 --> 00:10:15,550 And the hospice? The day centre? 101 00:10:15,600 --> 00:10:17,600 Checking up on me? 102 00:10:25,760 --> 00:10:28,750 Find out if any groups have got it in for this kind of research. 103 00:10:28,800 --> 00:10:31,430 - Yeah, James is doing that -- - Individuals too. Blogs. 104 00:10:31,480 --> 00:10:33,910 - Videos where they rant in their bedrooms. - Sir. 105 00:10:33,960 --> 00:10:37,430 - And check for any disgruntled ex-employees. - Doing that too. 106 00:10:37,480 --> 00:10:40,270 Right. So where are we with this Kate McMurdoch? 107 00:10:40,320 --> 00:10:43,910 Well, she's not at home, so Sergeant Maddox is trying to track her down. 108 00:10:43,960 --> 00:10:45,910 Maybe she's done a runner. 109 00:10:45,960 --> 00:10:48,430 Maybe it's a bit early to tell. 110 00:10:52,080 --> 00:10:54,630 (SIGHS) Imagine devoting your entire life 111 00:10:54,680 --> 00:10:56,830 to working out how to unravel knots. 112 00:10:56,880 --> 00:10:58,670 Imagine. 113 00:10:58,720 --> 00:11:02,110 Kate McMurdoch is currently on her way to the Cheddar Gorge. 114 00:11:02,160 --> 00:11:04,910 Mountaineering Club. They left this morning. 115 00:11:04,960 --> 00:11:06,870 - How long for? - Just for the day. 116 00:11:06,920 --> 00:11:09,920 I'll be waiting for her when she gets back. 117 00:11:11,160 --> 00:11:14,750 'An explosion ripped through the prestigious mathematics department 118 00:11:14,800 --> 00:11:16,750 at Oxford University earlier today. 119 00:11:16,800 --> 00:11:20,310 Police and treating it as suspicious and believe it to be...' 120 00:11:20,360 --> 00:11:22,750 - It's up. - Hardly surprising, is it? 121 00:11:22,800 --> 00:11:26,760 '.. one fatality confirmed, though a dozen students and staff treated...' 122 00:11:32,720 --> 00:11:35,470 Wallet, watch and wedding ring. 123 00:11:35,520 --> 00:11:37,750 You should be able to get a positive ID from those. 124 00:11:37,800 --> 00:11:39,630 Yeah, we'll get them round to his wife. 125 00:11:39,680 --> 00:11:43,080 At least her last memory of him won't be... that. 126 00:11:43,360 --> 00:11:46,030 - Thanks, love. - Have you got it? 127 00:11:46,960 --> 00:11:49,990 - Present, for the baby? - No... not yet. 128 00:11:50,040 --> 00:11:53,510 - Well, you suggested it. - Yeah, well, I've been a bit distracted 129 00:11:53,560 --> 00:11:55,910 with the bomb going off. You know how it is. 130 00:11:55,960 --> 00:11:57,990 All that way. 131 00:11:58,040 --> 00:12:00,510 We don't want to turn up empty-handed, do we? 132 00:12:00,560 --> 00:12:03,030 No, I'll get onto it. I promise. 133 00:12:04,440 --> 00:12:06,440 Exciting, isn't it? 134 00:12:18,120 --> 00:12:20,190 Yes. That's his. 135 00:12:20,240 --> 00:12:24,040 It has 'always' engraved on the inside, see? 136 00:12:25,520 --> 00:12:28,520 'Occasionally' would've been more accurate. 137 00:12:32,400 --> 00:12:34,590 I want to see him. 138 00:12:34,640 --> 00:12:37,750 That's not a good idea. 139 00:12:37,800 --> 00:12:40,230 We can arrange for someone to visit you if you'd like. 140 00:12:40,280 --> 00:12:42,270 No need. 141 00:12:42,320 --> 00:12:46,350 - And we're going to need access to some of his things. - Of course. 142 00:12:46,400 --> 00:12:49,070 His computer. His phone records, bank accounts. 143 00:12:49,120 --> 00:12:51,920 Help yourself. You won't find anything. 144 00:12:53,520 --> 00:12:56,110 Oh, were you going to give one of these lectures? 145 00:12:56,160 --> 00:12:58,150 We all were. 146 00:12:58,200 --> 00:13:01,070 David, me... Adam. 147 00:13:01,120 --> 00:13:04,470 - You're a mathematician too? - No, I'm a chemist. 148 00:13:04,520 --> 00:13:06,870 We do the lectures every year. 149 00:13:06,920 --> 00:13:08,990 Mine are usually demonstrations, 150 00:13:09,040 --> 00:13:11,430 chemical reactions, that sort of thing. 151 00:13:11,480 --> 00:13:14,200 Adam's were always more flashy. 152 00:13:15,200 --> 00:13:19,040 'Maths and the calculus of coitus' was a good one. 153 00:13:20,000 --> 00:13:22,310 Who knew maths could be such fun, right? 154 00:13:22,360 --> 00:13:24,630 And what is the Lockston Foundation? 155 00:13:24,680 --> 00:13:29,750 Donald. My father. He bankrolled Adam and David's research. 156 00:13:29,800 --> 00:13:33,040 Adam got to do whatever he liked and Dad picked up the bill. 157 00:13:34,880 --> 00:13:36,870 Oh, can we continue this outside? 158 00:13:36,920 --> 00:13:38,670 I have a lecture to give. 159 00:13:38,720 --> 00:13:40,510 Surely, in the circumstances -- 160 00:13:40,560 --> 00:13:42,470 I prefer it. 161 00:13:42,520 --> 00:13:44,510 Keep busy. Better than being alone. 162 00:13:44,560 --> 00:13:46,680 Not good at that. 163 00:13:52,120 --> 00:13:55,390 Five years, we were married. I should've left him long ago. 164 00:13:55,440 --> 00:13:58,910 - God knows he gave me enough reason. - He cheated on you? 165 00:13:58,960 --> 00:14:01,070 Forgive me, but... 166 00:14:01,120 --> 00:14:04,320 was your husband seeing anybody at the moment? 167 00:14:04,960 --> 00:14:06,950 I don't think so. 168 00:14:07,000 --> 00:14:09,870 I was surprised when he went into work early this morning. 169 00:14:09,920 --> 00:14:11,750 I thought maybe... another student. 170 00:14:11,800 --> 00:14:14,910 I tried leaving him three years ago. 171 00:14:14,960 --> 00:14:17,600 February 7th, my birthday. 172 00:14:18,600 --> 00:14:22,150 He'd gone to Toronto for a symposium and I packed my bags. 173 00:14:22,200 --> 00:14:24,230 You waited till he was out of the country? 174 00:14:24,280 --> 00:14:26,630 I've never been very good at confrontation. 175 00:14:26,680 --> 00:14:28,710 But even then, I still took him back. 176 00:14:28,760 --> 00:14:30,670 Hopeless. 177 00:14:30,720 --> 00:14:34,670 I tried hating him, especially after Paula, but that didn't work either. 178 00:14:34,720 --> 00:14:37,070 Hopeless case, really, so... 179 00:14:37,120 --> 00:14:40,150 - Who's Paula? - Paula Guitteau. 180 00:14:40,200 --> 00:14:43,190 She was one of his students and they had a thing. 181 00:14:43,240 --> 00:14:46,230 - Had? - They never last long, Inspector. 182 00:14:46,280 --> 00:14:49,150 The last time they met, Adam said he wanted to end it. 183 00:14:49,200 --> 00:14:51,430 Two days later, she started yelling rape. 184 00:14:51,480 --> 00:14:54,470 - And did your husband rape her? - No, of course he didn't. 185 00:14:54,520 --> 00:14:58,590 I mean, he never denied having sex with her, but it was consensual. 186 00:14:58,640 --> 00:15:00,510 For old times' sake. 187 00:15:00,560 --> 00:15:02,550 And you believed him? 188 00:15:02,600 --> 00:15:05,470 The girl had... issues. She was unreliable. 189 00:15:05,520 --> 00:15:09,070 So the charges didn't stick and the case was dropped. 190 00:15:09,120 --> 00:15:11,590 Where can we find this Paula Guitteau? 191 00:15:11,640 --> 00:15:13,630 You can't. 192 00:15:13,680 --> 00:15:15,840 She committed suicide. 193 00:15:30,220 --> 00:15:32,210 Mrs Guitteau? 194 00:15:32,260 --> 00:15:35,450 I'm Detective Inspector Lewis. This is DI Hathaway. 195 00:15:35,500 --> 00:15:38,240 We'd like to talk to you about Paula. 196 00:15:43,980 --> 00:15:46,210 Paula loved the garden. 197 00:15:46,260 --> 00:15:49,170 She and Frank used to do it together. 198 00:15:49,220 --> 00:15:54,090 Before Paula died, she went into the garden to pick some flowers. 199 00:15:54,140 --> 00:15:56,810 Peonies and forget-me-nots. 200 00:15:56,860 --> 00:16:01,380 And she put them in a vase and she left them here for us. 201 00:16:03,340 --> 00:16:05,860 And she went upstairs. 202 00:16:07,380 --> 00:16:10,580 This was after the rape charges were dropped? 203 00:16:18,620 --> 00:16:20,540 I found her. 204 00:16:22,220 --> 00:16:26,500 She'd used a belt and a hook on the back of the door. 205 00:16:31,780 --> 00:16:33,970 It was her word against his, you see. 206 00:16:34,020 --> 00:16:36,090 She didn't stand a chance. 207 00:16:36,140 --> 00:16:38,610 Not against the maths superstar. 208 00:16:38,660 --> 00:16:40,490 But they'd had a relationship? 209 00:16:40,540 --> 00:16:43,340 Is that what you'd call it? 210 00:16:44,500 --> 00:16:47,090 We're not exciting, Inspector, you know? 211 00:16:47,140 --> 00:16:48,890 We're just ordinary. 212 00:16:48,940 --> 00:16:52,810 To Paula, someone like Adam Capstone must have seemed... 213 00:16:52,860 --> 00:16:56,260 - She was flattered? - No, she was just a child. 214 00:16:56,900 --> 00:16:59,840 All he had to do was click his fingers... 215 00:17:02,500 --> 00:17:05,460 It left her feeling... dirty. 216 00:17:06,580 --> 00:17:10,220 She told him that she wanted to end it so he er... 217 00:17:13,980 --> 00:17:17,380 Afterwards, she felt so ashamed. 218 00:17:20,300 --> 00:17:24,000 It took me two days to convince her to tell someone. 219 00:17:24,260 --> 00:17:26,330 "Trust me," I said. 220 00:17:26,380 --> 00:17:28,850 "Tell the truth and everything will be OK." 221 00:17:28,900 --> 00:17:32,090 So it wasn't Adam Capstone who wanted to end the relationship? 222 00:17:32,140 --> 00:17:35,090 Nah. No, it was Paula. 223 00:17:35,140 --> 00:17:38,890 She stood up to him and he wouldn't accept it. 224 00:17:38,940 --> 00:17:40,940 So he made her pay. 225 00:17:43,900 --> 00:17:46,050 How did that make you feel? 226 00:17:46,100 --> 00:17:48,260 How do you think? 227 00:17:49,660 --> 00:17:53,140 I wish only bad things for Adam Capstone. 228 00:17:56,380 --> 00:17:58,370 What? 229 00:17:58,420 --> 00:18:01,420 Adam Capstone died this morning, Mrs Guitteau. 230 00:18:02,860 --> 00:18:05,600 Somebody sent him a bomb in the post. 231 00:18:06,940 --> 00:18:08,730 My God... 232 00:18:08,780 --> 00:18:12,010 Also a number of threatening letters. 233 00:18:12,060 --> 00:18:13,890 Not from me. 234 00:18:13,940 --> 00:18:16,080 What about your husband? 235 00:18:17,620 --> 00:18:22,020 Frank gardens, Inspector. 236 00:18:27,940 --> 00:18:30,410 Did Paula have other boyfriends? 237 00:18:30,460 --> 00:18:32,600 She never mentioned any. 238 00:18:33,860 --> 00:18:37,300 Well... might have been someone. 239 00:18:38,380 --> 00:18:42,570 (READS) Always remember 060302. 240 00:18:42,620 --> 00:18:44,610 Do those numbers mean anything to you? 241 00:18:44,660 --> 00:18:47,050 What, like a date or something? 242 00:18:47,100 --> 00:18:50,450 - 6th March, 2002. - Or the 3rd of June if you're American 243 00:18:50,500 --> 00:18:53,170 but that'd still make her only about seven. 244 00:18:53,220 --> 00:18:55,210 Sorry. No. 245 00:18:55,260 --> 00:18:57,260 Do you mind if...? 246 00:19:02,980 --> 00:19:05,330 Kate McMurdoch? 247 00:19:05,380 --> 00:19:08,180 DS Maddox. Have you got a few minutes? 248 00:19:11,780 --> 00:19:14,720 - Thanks, Mrs Guitteau. - Right, thanks. 249 00:19:15,580 --> 00:19:17,450 That was forensics. 250 00:19:17,500 --> 00:19:21,050 The bomb was made out of fulminated mercury packed into a small pipe. 251 00:19:21,100 --> 00:19:22,890 You open the box and... 252 00:19:22,940 --> 00:19:24,930 - Boom. - Mmm. 253 00:19:24,980 --> 00:19:28,490 Mercury's not easy stuff to get your hands on, especially not nowadays. 254 00:19:28,540 --> 00:19:32,210 OK, why don't we check if there have been any break-ins recently 255 00:19:32,260 --> 00:19:34,330 in warehouses, merchants, labs? 256 00:19:34,380 --> 00:19:36,330 Oh, listen. I need to make a little detour. 257 00:19:36,380 --> 00:19:38,370 I promised to buy a present for the baby. 258 00:19:38,420 --> 00:19:42,010 - Apparently we're not allowed to turn up emptyhanded. - No, it's bad form. 259 00:19:42,060 --> 00:19:43,890 - So, any ideas? - What, me? 260 00:19:43,940 --> 00:19:46,530 Something that says 'Oxford'. Metaphorically. 261 00:19:46,580 --> 00:19:48,580 Pair of handcuffs? 262 00:19:49,580 --> 00:19:52,530 You know Frank Guitteau's job is collecting office waste? 263 00:19:52,580 --> 00:19:55,810 Picking up electrical goods for recycling, that sort of thing. 264 00:19:55,860 --> 00:19:59,500 - So? - There's mercury in fluorescent light bulbs. 265 00:20:00,500 --> 00:20:02,650 So, do you want to go back to the station 266 00:20:02,700 --> 00:20:05,010 and take a closer look at Frank Guitteau? 267 00:20:05,060 --> 00:20:07,610 - What about the present? - Nah, later. 268 00:20:07,660 --> 00:20:09,930 Two years I was on the team. 269 00:20:09,980 --> 00:20:12,810 David invited me to join after I graduated. 270 00:20:12,860 --> 00:20:14,530 To study knots? 271 00:20:14,580 --> 00:20:16,780 It sounds mad, doesn't it? 272 00:20:17,700 --> 00:20:20,440 - But our research -- - OUR research? 273 00:20:21,660 --> 00:20:23,650 I still feel a part of it. 274 00:20:23,700 --> 00:20:26,020 And yet you walked away. 275 00:20:27,020 --> 00:20:29,010 Yeah, a couple of months ago. 276 00:20:29,060 --> 00:20:33,170 Adam and David were heading down a dead end. I steered them away. 277 00:20:33,220 --> 00:20:36,690 And more than that, it was that study of spiral knot determinants 278 00:20:36,740 --> 00:20:38,650 that led to everything else. 279 00:20:38,700 --> 00:20:40,730 There wouldn't have been a breakthrough 280 00:20:40,780 --> 00:20:42,810 if it hadn't have been for me. 281 00:20:42,860 --> 00:20:46,410 Afterwards, when Adam and David presented their findings... 282 00:20:46,460 --> 00:20:48,690 I wasn't even mentioned. 283 00:20:48,740 --> 00:20:51,970 It was like they'd done all the work themselves. 284 00:20:52,020 --> 00:20:55,250 I'd been photoshopped out. 285 00:20:55,300 --> 00:20:59,090 I went to them. I told them I thought it was unfair. 286 00:20:59,140 --> 00:21:02,340 And Adam said all I'd done was the grunt work. 287 00:21:03,220 --> 00:21:05,210 I hadn't made the final connection, 288 00:21:05,260 --> 00:21:07,770 even though it was right there in front of me. 289 00:21:07,820 --> 00:21:09,980 "Grunt work". 290 00:21:11,260 --> 00:21:13,130 Must have made you very angry. 291 00:21:13,180 --> 00:21:15,420 I yelled a bit, yeah. 292 00:21:16,500 --> 00:21:18,570 Eyewitness said you went... 293 00:21:18,620 --> 00:21:20,760 "batshit in the atrium". 294 00:21:22,620 --> 00:21:24,620 Maybe a little. 295 00:21:26,540 --> 00:21:30,010 Somebody sent David and Adam Capstone threatening letters. 296 00:21:30,060 --> 00:21:32,180 Not me. 297 00:21:38,420 --> 00:21:40,420 OK. We're done. 298 00:21:42,140 --> 00:21:45,410 As you can see, I still have some movement. 299 00:21:45,460 --> 00:21:48,770 I've got the full Stephen Hawking to look forward to. 300 00:21:48,820 --> 00:21:51,050 It's genetic, no known cure. 301 00:21:51,100 --> 00:21:53,730 Is that why you agreed to fund the Capstones? 302 00:21:53,780 --> 00:21:55,970 To find a cure? 303 00:21:56,020 --> 00:21:58,330 I'm beyond all help. 304 00:21:58,380 --> 00:22:01,490 But if their research can make a difference after I'm gone, 305 00:22:01,540 --> 00:22:03,410 and I make it possible... 306 00:22:03,460 --> 00:22:06,770 - that's got to be worth something, hasn't it? - A legacy. 307 00:22:06,820 --> 00:22:09,330 Better than a blue plaque. 308 00:22:09,380 --> 00:22:11,970 Did you know Adam Capstone? 309 00:22:12,020 --> 00:22:13,730 No. Not very well. 310 00:22:13,780 --> 00:22:16,810 He used to come sometimes with Elizabeth, Donald's daughter, 311 00:22:16,860 --> 00:22:18,530 but we didn't speak much. 312 00:22:18,580 --> 00:22:22,770 Were either of you aware of the allegations made by Paula Guitteau? 313 00:22:22,820 --> 00:22:26,690 Well, the... The girl was troubled. 314 00:22:26,740 --> 00:22:31,370 What she did was terrible, but that was her choice. 315 00:22:31,420 --> 00:22:33,850 Adam was entirely blameless, is that what you think? 316 00:22:33,900 --> 00:22:35,690 I think it's none of our business. 317 00:22:35,740 --> 00:22:37,810 I suppose you're right. 318 00:22:38,780 --> 00:22:40,690 I should go. Grace'll be hungry. 319 00:22:40,740 --> 00:22:42,530 - Grace? - My three-year-old. 320 00:22:42,580 --> 00:22:45,930 She's with the childminder. She doesn't like to be kept waiting. 321 00:22:45,980 --> 00:22:48,450 Especially when food's involved, I bet. 322 00:22:48,500 --> 00:22:51,250 - You've got kids? - One of each. 323 00:22:51,300 --> 00:22:54,170 A long time since they were three, mind. 324 00:22:54,740 --> 00:22:57,450 I'll check in later. We can do some neck stretches. 325 00:22:57,500 --> 00:22:59,610 Gentlemen. 326 00:22:59,660 --> 00:23:01,810 Sarah. She lives in. 327 00:23:01,860 --> 00:23:04,010 Easier to torture me. 328 00:23:04,060 --> 00:23:07,250 I don't know what I'd do without her. Wither, I suppose. 329 00:23:07,300 --> 00:23:09,840 Would you excuse me for a minute? 330 00:23:12,180 --> 00:23:14,180 Ms Alderwood? 331 00:23:15,580 --> 00:23:18,250 - Adam Capstone... - What about him? 332 00:23:18,300 --> 00:23:20,490 You didn't like him very much, did you? 333 00:23:20,540 --> 00:23:22,650 Adam was a shit, frankly. 334 00:23:22,700 --> 00:23:24,770 Which is how he treated Elizabeth. 335 00:23:24,820 --> 00:23:27,050 How did Donald feel about that? 336 00:23:27,100 --> 00:23:30,130 Donald spends 90% of his day just trying to get through it. 337 00:23:30,180 --> 00:23:32,330 A large part of my job is to help him do that. 338 00:23:32,380 --> 00:23:35,490 Now, if that means avoiding ways of upsetting him, then fine. 339 00:23:35,540 --> 00:23:39,010 So we pussyfoot around the subject, pretend that everything's OK. 340 00:23:39,060 --> 00:23:41,410 Can't been easy. 341 00:23:41,460 --> 00:23:43,890 I'd do anything for Donald. 342 00:23:43,940 --> 00:23:47,740 Even if I could, I wouldn't get involved. It's not my place. 343 00:23:48,940 --> 00:23:51,810 Besides, Elizabeth is tougher than she thinks. 344 00:23:51,860 --> 00:23:55,850 All that self-doubt and no confidence on the outside, 345 00:23:55,900 --> 00:23:58,010 but on the inside... 346 00:23:58,060 --> 00:24:00,130 just like her mother. 347 00:24:00,180 --> 00:24:02,580 Pure tungsten. 348 00:24:04,300 --> 00:24:06,130 No break-ins here, I'm happy to say. 349 00:24:06,180 --> 00:24:08,570 Everything's kept under strict lock and key. 350 00:24:08,620 --> 00:24:11,290 So who normally has access to all of the chemicals? 351 00:24:11,340 --> 00:24:13,130 Students and members of staff. 352 00:24:13,180 --> 00:24:15,210 We er... We each have a key card 353 00:24:15,260 --> 00:24:17,570 and everything has to be accounted for. 354 00:24:17,620 --> 00:24:20,050 - How hard is it to fulminate mercury? - It's not. 355 00:24:20,100 --> 00:24:23,050 You just mix mercury with concentrated nitric acid 356 00:24:23,100 --> 00:24:26,970 and add the resulting aqueous mercury nitrate to ethanol. Simple. 357 00:24:27,020 --> 00:24:30,460 - So anyone could do it? - If they have the chemicals. 358 00:24:31,500 --> 00:24:33,490 Ah, Professor Dimmock. You're busy. 359 00:24:33,540 --> 00:24:37,290 That's all right. I'm being grilled by the police. It's very exciting. 360 00:24:37,340 --> 00:24:39,570 DS Maddox. And you are? 361 00:24:39,620 --> 00:24:41,610 Djimon Adomakoh. 362 00:24:41,660 --> 00:24:45,250 Mr Adomakoh is one of our brightest stars, all the way from New York. 363 00:24:45,300 --> 00:24:47,650 A postgraduate research fellowship beckons. 364 00:24:47,700 --> 00:24:50,090 - Congratulations. - Thank you. 365 00:24:50,140 --> 00:24:52,010 Were you looking for me? 366 00:24:52,060 --> 00:24:54,660 Er... yes, but it can wait. Sorry. 367 00:24:55,940 --> 00:24:59,250 I'm going to need a list of all students and staff. 368 00:24:59,300 --> 00:25:01,370 - Anyone who has access. - Of course. 369 00:25:01,420 --> 00:25:04,050 You take security seriously here? 370 00:25:04,100 --> 00:25:06,410 Students with unlimited access to chemicals 371 00:25:06,460 --> 00:25:09,250 and the knowledge to turn them into something illegal -- 372 00:25:09,300 --> 00:25:11,970 asking for trouble, don't you think? 373 00:25:27,780 --> 00:25:29,780 (PANTS) 374 00:25:39,820 --> 00:25:42,130 ELIZABETH: 'Mercury's a real pain. 375 00:25:42,180 --> 00:25:45,490 Especially if you spill it. So, you know, don't.' 376 00:25:45,540 --> 00:25:48,930 MADDOX: She's got loads of videos online. Lectures, demos. All sorts. 377 00:25:48,980 --> 00:25:52,290 She wouldn't have any problem getting hold of mercury. 378 00:25:52,340 --> 00:25:54,330 And she'd know what to do with it. 379 00:25:54,380 --> 00:25:56,930 Plus she said she hates confrontation. 380 00:25:56,980 --> 00:26:00,010 What, you're saying it's easier to send a bomb than just have a row? 381 00:26:00,060 --> 00:26:02,890 Well, we know she resented Adam's behaviour 382 00:26:02,940 --> 00:26:05,570 but couldn't bring herself to leave him. 383 00:26:05,620 --> 00:26:07,570 Which would make her resent him even more. 384 00:26:07,620 --> 00:26:11,690 And I've seen a lot of grieving widows, but never one like her. 385 00:26:11,740 --> 00:26:13,970 Right, I'm gone. 386 00:26:14,020 --> 00:26:17,130 I've got to skype Tony. They've just offered him another year. 387 00:26:17,180 --> 00:26:20,540 - Have you said yes? - We are thinking about it. 388 00:26:22,300 --> 00:26:24,770 Well that's... great, isn't it? 389 00:26:24,820 --> 00:26:26,530 Er... yeah. 390 00:26:26,580 --> 00:26:28,370 Yes. 391 00:26:28,420 --> 00:26:31,010 Better prospects. Better money. Better pension. 392 00:26:31,060 --> 00:26:34,180 We're dead happy. See you in a bit. 393 00:26:38,420 --> 00:26:40,410 Right, I'm going to scoot too. 394 00:26:40,460 --> 00:26:42,130 What, is it something I said? 395 00:26:42,180 --> 00:26:44,330 No. I'm just going to go and sit with Dad. 396 00:26:44,380 --> 00:26:47,780 He seems to like it this time of day. Toodle pip! 397 00:27:05,740 --> 00:27:09,010 My wife's thinking of getting a new car. Hatchback. 398 00:27:09,060 --> 00:27:10,850 Card. 399 00:27:10,900 --> 00:27:12,650 I think a bike's better. 400 00:27:12,700 --> 00:27:14,500 Stand. 401 00:27:35,460 --> 00:27:39,050 ANSWERPHONE: 'Hi, it's Adam. I'm obviously being a genius somewhere, 402 00:27:39,100 --> 00:27:41,170 or, more likely, I've forgotten my phone, 403 00:27:41,220 --> 00:27:43,570 so leave me a message and I promise I'll get back 404 00:27:43,620 --> 00:27:45,370 just as soon as I stop being a genius 405 00:27:45,420 --> 00:27:48,360 or find my phone, whichever comes first.' 406 00:28:05,420 --> 00:28:08,290 ELIZABETH: '.. it's useful to have a mercury spillage kit, 407 00:28:08,340 --> 00:28:10,170 which contains sulphur and lime...' 408 00:28:10,220 --> 00:28:12,370 Brushing up on your chemistry? 409 00:28:12,420 --> 00:28:16,130 She's good, in a Royal Institute Christmas Lecture-type way. 410 00:28:16,180 --> 00:28:18,090 And I bet you watched every one of them. 411 00:28:18,140 --> 00:28:20,340 Highlight of my holidays. 412 00:28:22,420 --> 00:28:25,580 Adam Capstone certainly seems to be enjoying it. 413 00:28:27,060 --> 00:28:29,340 And so does Paula Guitteau. 414 00:28:30,300 --> 00:28:33,970 I've also been checking up on Adam Capstone's emails. 415 00:28:34,020 --> 00:28:36,730 I don't suppose his passcode's 060302? 416 00:28:36,780 --> 00:28:40,090 - Not that simple, sadly. - Never is. 417 00:28:40,140 --> 00:28:42,140 Oh, hang on. 418 00:28:43,180 --> 00:28:46,530 These, he's deleted off the computer but they've stayed on the server. 419 00:28:46,580 --> 00:28:50,480 - They're emails from his brother. - So why delete them? 420 00:28:51,700 --> 00:28:53,930 (READS) Think of someone else for a change. 421 00:28:53,980 --> 00:28:56,320 Carry on, and I'll kill you. 422 00:28:56,900 --> 00:28:59,380 I'm guessing that's why. 423 00:29:02,720 --> 00:29:04,710 Yes, we argued. 424 00:29:04,760 --> 00:29:07,160 "Carry on, and I'll kill you"? 425 00:29:08,200 --> 00:29:12,150 I was angry. I said some terrible things and I wish that erm... 426 00:29:12,200 --> 00:29:14,990 You argued about who would benefit from your discovery? 427 00:29:15,040 --> 00:29:19,110 Yes. Adam was all, it belongs to the world. 428 00:29:19,160 --> 00:29:21,270 And you disagree? 429 00:29:21,320 --> 00:29:24,230 Why shouldn't we make some money? We've worked hard enough. 430 00:29:24,280 --> 00:29:28,230 So you agreed to sell to AKGC Pharmaceutical? 431 00:29:28,280 --> 00:29:30,510 Who have the wherewithal to develop a product 432 00:29:30,560 --> 00:29:32,350 that will change the world. 433 00:29:32,400 --> 00:29:35,670 What we've discovered is the first step. The toolbox, if you like. 434 00:29:35,720 --> 00:29:38,710 There's still a long way before there's a drug on the market. 435 00:29:38,760 --> 00:29:41,350 And if they want to pay us for that, where's the harm? 436 00:29:41,400 --> 00:29:44,790 Adam didn't seem to think that money was the issue. 437 00:29:44,840 --> 00:29:47,400 You never do when you have it. 438 00:29:48,960 --> 00:29:51,430 Do you need money, Mr Capstone? 439 00:29:51,480 --> 00:29:53,150 No, as it happens. 440 00:29:53,200 --> 00:29:55,390 Besides, Adam was being a bit disingenuous. 441 00:29:55,440 --> 00:29:57,110 There's still money to be had. 442 00:29:57,160 --> 00:30:00,830 Recognition. Tenure at a nice, rich college in the States. 443 00:30:00,880 --> 00:30:03,840 Did like your brother, Mr Capstone? 444 00:30:04,840 --> 00:30:07,040 How can you even ask that? 445 00:30:08,960 --> 00:30:11,350 Yes, we rowed. 446 00:30:11,400 --> 00:30:13,550 Yes, I disagreed with some of the things he did. 447 00:30:13,600 --> 00:30:16,630 But... Adam knew me better than anyone, 448 00:30:16,680 --> 00:30:18,600 and I him. 449 00:30:20,280 --> 00:30:23,310 My whole life, there hasn't been a day that he wasn't a part of. 450 00:30:23,360 --> 00:30:26,230 He was my brother, so never make the mistake, Inspector, 451 00:30:26,280 --> 00:30:28,950 of thinking that I didn't love him. 452 00:30:30,200 --> 00:30:32,670 How well did you know Paula Guitteau? 453 00:30:32,720 --> 00:30:36,310 I didn't. I never taught her. Adam looked after her. 454 00:30:36,360 --> 00:30:39,390 You stood by your brother even after she accused him of raping her. 455 00:30:39,440 --> 00:30:41,230 Yes. 456 00:30:41,280 --> 00:30:44,150 And after she... did what she did. 457 00:30:44,200 --> 00:30:48,070 Which sort of answers your earlier question, doesn't it? 458 00:30:48,120 --> 00:30:49,920 Sort of. 459 00:30:52,960 --> 00:30:55,190 Look, I know the emails look bad. 460 00:30:55,240 --> 00:30:57,950 It's the last thing I said to my brother 461 00:30:58,000 --> 00:31:00,910 and I never got the chance to put it right. 462 00:31:00,960 --> 00:31:04,350 The deal still going through with AKGC? 463 00:31:04,400 --> 00:31:07,270 Yes. It always was. 464 00:31:07,320 --> 00:31:09,950 Now, if you'll excuse me, I have a fundraiser to attend. 465 00:31:10,000 --> 00:31:13,960 It's not that I really feel like it but, you know, duty calls. 466 00:31:36,760 --> 00:31:40,310 Ah, Inspector. I didn't see you on the guest list. 467 00:31:40,360 --> 00:31:43,070 Yeah, I'm sorry. I realise this isn't very convenient, 468 00:31:43,120 --> 00:31:46,310 but I do have a couple of questions I need to ask you if that's OK? 469 00:31:46,360 --> 00:31:50,760 Perfectly. Professor Dimmock here was just about to leave anyway. 470 00:31:53,560 --> 00:31:56,150 Let's go and find somewhere a bit quieter. 471 00:31:56,200 --> 00:31:58,550 Give my smile muscles a bit of a rest. 472 00:31:58,600 --> 00:32:01,030 About the only ones I've got left. 473 00:32:01,080 --> 00:32:02,960 Come this way. 474 00:32:08,240 --> 00:32:11,870 Did you know that David was hoping to sell their research 475 00:32:11,920 --> 00:32:14,270 to AKGC Pharmaceutical? 476 00:32:14,320 --> 00:32:16,310 Yes. 477 00:32:16,360 --> 00:32:19,000 And Adam disagreed? 478 00:32:20,000 --> 00:32:21,790 It was his right. 479 00:32:21,840 --> 00:32:24,830 It wasn't meant to be about getting rich quick. 480 00:32:24,880 --> 00:32:26,550 So you didn't approve? 481 00:32:26,600 --> 00:32:29,470 Well, the money didn't come with any strings, Inspector, 482 00:32:29,520 --> 00:32:31,230 but, no, I didn't like it. 483 00:32:31,280 --> 00:32:34,360 And now there's nothing stopping it from happening. 484 00:32:36,960 --> 00:32:39,510 David had it hard growing up. 485 00:32:39,560 --> 00:32:41,350 In what way? 486 00:32:41,400 --> 00:32:45,270 Whatever David did, Adam did quicker. And younger. 487 00:32:45,320 --> 00:32:48,270 A levels. Oxbridge entry. 488 00:32:48,320 --> 00:32:53,320 David is brilliant, but Adam was the truly gifted one. 489 00:32:54,320 --> 00:32:58,360 He could see connections. Make leaps that others... 490 00:32:59,480 --> 00:33:02,270 .. that David couldn't. 491 00:33:02,320 --> 00:33:05,430 On the other hand, David could do all the groundwork. 492 00:33:05,480 --> 00:33:08,550 Put in the hours, build the foundations. 493 00:33:08,600 --> 00:33:10,270 And then Adam would come along... 494 00:33:10,320 --> 00:33:12,110 .. and steal all the glory? 495 00:33:12,160 --> 00:33:15,150 Well, make all the difference. 496 00:33:15,200 --> 00:33:17,790 And was David jealous? 497 00:33:17,840 --> 00:33:20,070 He understood. 498 00:33:20,120 --> 00:33:23,390 They complemented each other. 499 00:33:23,440 --> 00:33:27,750 Singly, they were remarkable mathematicians, but flawed. 500 00:33:27,800 --> 00:33:30,560 Together, they were extraordinary. 501 00:33:31,920 --> 00:33:35,880 (SIGHS) David loved his brother, Inspector. 502 00:33:37,480 --> 00:33:39,870 He'd never harm him. 503 00:33:39,920 --> 00:33:41,750 Not David. 504 00:33:41,800 --> 00:33:43,870 Would you like me to...? 505 00:33:43,920 --> 00:33:46,080 Yes, Thank you. 506 00:33:53,720 --> 00:33:56,520 - Came for a top-up. - Help yourself. 507 00:33:59,400 --> 00:34:01,390 This not your thing? 508 00:34:01,440 --> 00:34:03,150 Rubbish at all the glad-handing. 509 00:34:03,200 --> 00:34:05,990 Besides, she likes my full attention when she's eating. 510 00:34:06,040 --> 00:34:07,990 That's the thing about three-year-olds. 511 00:34:08,040 --> 00:34:09,830 So set in their ways. 512 00:34:09,880 --> 00:34:11,870 Oh, I've always wanted to go there. 513 00:34:11,920 --> 00:34:13,790 I saw those when I was in Toronto. 514 00:34:13,840 --> 00:34:15,870 It was winter. They were frozen solid. 515 00:34:15,920 --> 00:34:17,590 Amazing. 516 00:34:17,640 --> 00:34:20,390 Oh, try to keep hold of it, munchkin. 517 00:34:20,440 --> 00:34:22,780 Always more useful that way. 518 00:34:27,720 --> 00:34:30,270 - When did you say that was? - What? 519 00:34:30,320 --> 00:34:32,830 - That you were in Canada. - Three years ago. 520 00:34:32,880 --> 00:34:34,920 February, was it? 521 00:34:36,320 --> 00:34:39,320 The same time that Adam Capstone was there. 522 00:34:43,600 --> 00:34:45,870 How old did you say she is? 523 00:34:57,600 --> 00:34:59,990 It began soon after I started here. 524 00:35:00,040 --> 00:35:04,790 I was vulnerable and Adam sensed it. Easy pickings. 525 00:35:04,840 --> 00:35:07,430 - Vulnerable? - I was lonely. 526 00:35:07,480 --> 00:35:11,270 I'd lost my job at the hospital and I was going through a rough patch. 527 00:35:11,320 --> 00:35:13,790 My husband divorced me. I was a mess. 528 00:35:13,840 --> 00:35:17,120 But coming here was the first step back. 529 00:35:18,120 --> 00:35:20,070 Adam was funny and attentive... 530 00:35:20,120 --> 00:35:22,510 and I... 531 00:35:22,560 --> 00:35:24,390 I adored him. 532 00:35:24,440 --> 00:35:26,780 Or at least I thought I did. 533 00:35:28,760 --> 00:35:31,990 So, what happened when you found out you were pregnant? 534 00:35:32,040 --> 00:35:34,350 I told him I was going to keep her. 535 00:35:34,400 --> 00:35:37,990 And he made me promise not to tell anyone who the father was. 536 00:35:38,040 --> 00:35:39,750 Promise? In return for what? 537 00:35:39,800 --> 00:35:41,590 - Money? - For a while. 538 00:35:41,640 --> 00:35:44,110 Then Elizabeth found out about the payments. 539 00:35:44,160 --> 00:35:46,560 Adam fessed up. That was that. 540 00:35:47,400 --> 00:35:49,270 So Elizabeth knew? 541 00:36:00,680 --> 00:36:02,990 Where are we with the grieving dad? 542 00:36:03,040 --> 00:36:06,110 - Frank Guitteau? Still digging. - You think he could make a bomb? 543 00:36:06,160 --> 00:36:09,150 Fulminating mercury is not that hard if you've got the right kit. 544 00:36:09,200 --> 00:36:11,270 Even so, it's a bit specialised, isn't it? 545 00:36:11,320 --> 00:36:13,190 It's hardly your basic weapon of choice. 546 00:36:13,240 --> 00:36:15,030 Then there's the hate mail. 547 00:36:15,080 --> 00:36:16,950 - That's a major line of enquiry. - So it is. 548 00:36:17,000 --> 00:36:19,070 Professor Dimmock from the chemistry lab 549 00:36:19,120 --> 00:36:21,950 has given me a list of those who have access to the supplies. 550 00:36:22,000 --> 00:36:23,790 Start with them. 551 00:36:23,840 --> 00:36:27,000 Maybe one has links to the maths department we don't know about. 552 00:36:30,880 --> 00:36:32,880 (MOBILE PHONE RINGS) 553 00:36:34,320 --> 00:36:36,310 (SIGHS) 554 00:36:36,360 --> 00:36:38,360 (TUTS) 555 00:36:47,800 --> 00:36:51,590 'This is a message for Mr Djimon Adomakoh 556 00:36:51,640 --> 00:36:54,840 to call Sergeant Maddox at Oxford Police. Thank you.' 557 00:37:11,040 --> 00:37:13,040 Police want to see me. 558 00:37:27,640 --> 00:37:29,910 - It's not enough. - It's what we agreed. 559 00:37:29,960 --> 00:37:32,030 - I need more. - That's all there is. 560 00:37:32,080 --> 00:37:35,080 - You owe me. - I owe you what's in there. 561 00:37:36,240 --> 00:37:38,510 - I'm calling it a day. - What? 562 00:37:38,560 --> 00:37:41,230 - It's too dangerous. - We're not doing anything illegal. 563 00:37:41,280 --> 00:37:43,470 Tell that to the pit boss. 564 00:37:43,520 --> 00:37:45,470 Please, David. 565 00:37:45,520 --> 00:37:47,630 A few more games. Don't I deserve that? 566 00:37:47,680 --> 00:37:50,030 No, we quit while we're ahead. 567 00:37:50,080 --> 00:37:52,350 And you just get to decide? 568 00:37:54,200 --> 00:37:56,000 That's right. 569 00:38:13,280 --> 00:38:15,270 - They'll find out. - You don't know that. 570 00:38:15,320 --> 00:38:18,470 If the police are asking questions, they will find out. 571 00:38:18,520 --> 00:38:20,630 It's gonna be OK. We just wait it out. 572 00:38:20,680 --> 00:38:22,790 What else can we do? 573 00:38:22,840 --> 00:38:24,840 Come on. 574 00:38:43,160 --> 00:38:46,310 - So the wife knew about the baby? - According to Sarah Alderwood, yeah. 575 00:38:46,360 --> 00:38:49,510 Plus, money from the pharmaceutical deal her husband opposed. 576 00:38:49,560 --> 00:38:51,750 With him out the way, it's sure to go through. 577 00:38:51,800 --> 00:38:54,230 And as his widow, she stands to benefit bigtime. 578 00:38:54,280 --> 00:38:57,790 So that's two motives and unlimited access to mercury, right? 579 00:38:57,840 --> 00:38:59,710 I think I've got something. 580 00:38:59,760 --> 00:39:02,150 We know that the letters sent to Adam Capstone 581 00:39:02,200 --> 00:39:04,750 were processed through these sorting offices -- 582 00:39:04,800 --> 00:39:06,910 Wallingford... Thame... 583 00:39:06,960 --> 00:39:09,230 and Kidlington. 584 00:39:09,280 --> 00:39:12,070 And this is a copy of Frank Guitteau's pick-up itinerary 585 00:39:12,120 --> 00:39:13,910 for the whole of the last month. 586 00:39:13,960 --> 00:39:15,870 On the day the letters were sent, 587 00:39:15,920 --> 00:39:18,110 he had pick-ups in Thame, Kidlington... 588 00:39:18,160 --> 00:39:20,080 Wallingford. 589 00:39:34,160 --> 00:39:36,150 It's a coincidence, that's all! 590 00:39:36,200 --> 00:39:38,510 Yes, I was in those places. 591 00:39:38,560 --> 00:39:41,470 So what? So were a lot of people. Hey, it's my job. 592 00:39:41,520 --> 00:39:43,630 Do you handle a lot of fluorescent bulbs here? 593 00:39:43,680 --> 00:39:45,550 A fair amount. 594 00:39:45,600 --> 00:39:49,310 - Do you know how to extract mercury from them? - Of course I don't. Why? 595 00:39:49,360 --> 00:39:52,630 The bomb that killed Adam Capstone was made from mercury. 596 00:39:52,680 --> 00:39:54,510 And you hold Adam Capstone responsible 597 00:39:54,560 --> 00:39:57,110 - for the death of your daughter. - He was responsible. 598 00:39:57,160 --> 00:39:59,350 You wanted to make him pay for what he'd done? 599 00:39:59,400 --> 00:40:02,070 I wanted him to be scared. I didn't want to kill him. 600 00:40:02,120 --> 00:40:03,960 Look... 601 00:40:05,760 --> 00:40:07,910 They were just letters. 602 00:40:07,960 --> 00:40:10,190 OK? Nothing else. 603 00:40:10,240 --> 00:40:13,470 He'd got off scot-free. Like nothing had ever happened. Whereas we... 604 00:40:13,520 --> 00:40:15,590 Do you know my wife spends her waking hours 605 00:40:15,640 --> 00:40:18,470 volunteering for every bloody charity you can think of? 606 00:40:18,520 --> 00:40:22,560 She's more interested in strangers than she is me. 607 00:40:24,280 --> 00:40:28,040 We just live in this... fog. 608 00:40:30,920 --> 00:40:34,110 I couldn't save my girl and now I can't save my wife. 609 00:40:34,160 --> 00:40:36,470 I wanted to make him hurt a little. 610 00:40:36,520 --> 00:40:39,080 I could do that, at least. 611 00:40:42,040 --> 00:40:45,320 I'm sorry, Frank, we're going to have to take you down the station. 612 00:40:47,760 --> 00:40:49,760 16. 613 00:40:51,080 --> 00:40:53,080 Card. 614 00:40:54,080 --> 00:40:56,080 Too many. 615 00:41:27,480 --> 00:41:29,270 Is this necessary? 616 00:41:29,320 --> 00:41:32,350 Your husband didn't say anything to you about what he was doing? 617 00:41:32,400 --> 00:41:34,190 - No! - You had no idea? 618 00:41:34,240 --> 00:41:38,160 Since Paula died, we don't say much to each other about anything. 619 00:41:48,760 --> 00:41:51,700 David Capstone said he didn't know Paula. 620 00:41:54,320 --> 00:41:56,790 He obviously gave her tutorials too. 621 00:41:56,840 --> 00:41:59,510 Look, he marked some of her papers. 622 00:42:02,680 --> 00:42:04,870 Yes, Mr Capstone, it's DI Hathaway. 623 00:42:04,920 --> 00:42:07,390 Erm... I need to ask you a few more questions. 624 00:42:07,440 --> 00:42:09,440 Clarify a few things. 625 00:42:10,920 --> 00:42:13,320 Yeah, see you in half an hour. 626 00:42:13,960 --> 00:42:15,960 David. 627 00:42:17,080 --> 00:42:19,070 We've been through this. 628 00:42:19,120 --> 00:42:21,790 After everything I've done for you? 629 00:42:22,560 --> 00:42:24,560 Go home, Andrew. 630 00:42:34,600 --> 00:42:36,590 What did you get in the end? 631 00:42:36,640 --> 00:42:38,840 - Sorry? - For the baby. 632 00:42:39,640 --> 00:42:41,630 Nothing. Yet. 633 00:42:41,680 --> 00:42:43,910 I haven't found the right thing. 634 00:42:43,960 --> 00:42:45,800 Go on. 635 00:42:46,800 --> 00:42:49,150 You should probably tell Laura, you know. 636 00:42:49,200 --> 00:42:52,030 - What? - That you don't want to go. 637 00:42:52,080 --> 00:42:56,270 Look, I just haven't got around to buying anything, that's all. 638 00:42:56,320 --> 00:42:58,120 Right. 639 00:42:59,680 --> 00:43:01,670 I forgot. 640 00:43:01,720 --> 00:43:03,860 And that's not symbolic. 641 00:43:16,560 --> 00:43:18,470 - (CLASSICAL MUSIC BLASTS) - Mr Capstone! 642 00:43:18,520 --> 00:43:20,520 (RINGS DOORBELL) 643 00:43:23,160 --> 00:43:25,150 David Capstone! 644 00:43:25,200 --> 00:43:26,960 Help me! 645 00:43:29,560 --> 00:43:31,560 - David! - In here. 646 00:43:32,560 --> 00:43:34,900 Shut that row off, will you? 647 00:43:38,360 --> 00:43:40,150 (SWITCHES MUSIC OFF) 648 00:43:40,200 --> 00:43:42,350 - What do I do? - Just put it down very carefully. 649 00:43:42,400 --> 00:43:45,340 Give me bomb disposal. 119 Oldfield Road. 650 00:43:46,280 --> 00:43:48,070 I can't. It'll go off. 651 00:43:48,120 --> 00:43:50,040 Nice and gentle. 652 00:43:52,080 --> 00:43:54,080 David, look at me. 653 00:43:55,080 --> 00:43:58,640 Just put it down very slowly. 654 00:44:02,920 --> 00:44:04,910 You can do this. 655 00:44:04,960 --> 00:44:07,030 I don't wanna die. 656 00:44:07,080 --> 00:44:09,080 Nobody's gonna die. 657 00:44:32,280 --> 00:44:36,040 Sir? It's Lewis and Hathaway. There's been another explosion.