'We can't. He's been charged.'

I exhaled loudly. 'Just look into her background. That's all I'm asking.'

'All right, I'll see what I can do.' There was a short pause. 'What were those men after you for last night?'

'Because I made a mistake. I got involved in something I shouldn't have, and now they want to make me pay the price.'

'I never took you to be corrupt, Sarge… Dennis. What the hell made you think you could get away with it?'

I ignored the question. 'I'm sorry. I truly am.' I wanted to say something else, but I didn't know what, and I didn't have the time anyway. He started to repeat the question but I hung up, sad that now even he was against me. But not really that surprised.

I jogged across the road and into Hyde Park, feeling like a pariah. I didn't think they'd had time to get a trace on me, but there was no point hanging around to get proved wrong, so I made my way slowly back to Bayswater, figuring that my next move was to buy some clothes and a toothbrush.

As the day wore on, I couldn't help thinking that Carla Graham was going to get away with her role in the murder of Miriam Fox. Malik hadn't seemed overly interested in what I had to say; even if he did believe me, there was no way Knox or Capper or anyone else was going to act on it. In the end, what was there to act on? Just the word of a disgraced police officer who was now on the run.

It bothered me that justice wouldn't be done. I suppose you could say that justice is rarely done in this world and that the vast majority of people don't get the fate they deserve, but that would be missing the point. I knew Carla Graham had done wrong and I wanted her to be called to account for it. I also wanted to find out whether she could shed any light on what had happened to Molly Hagger and Anne Taylor. I was pretty certain by now that Molly was dead and it was important to me to find out why and how. And who it was who'd killed her. It would, I thought, be a chance to atone for my many sins. Even if no-one ever realized that I'd solved the case and punished the perpetrators, at least I would have the satisfaction of having redeemed myself in my own eyes. Which was a lot better than nothing.

It wasn't going to be easy to get Carla to talk voluntarily, I knew that. Knowing her, she'd already have some story concocted as to how she'd found out about the manner of Miriam Fox's death – she was obviously pretty creative in that department – and would be fully aware that one verbal slip-up on her part to a man who'd just resigned from the police force was not exactly going to do a great deal to build a criminal case against her. But get her to talk I would. Carla Graham was a tough cookie who'd be able to withstand some pretty rigorous questioning, but this time it wouldn't do her any good. I would be visiting her in a very unofficial capacity. And with nothing to lose.

By four o'clock that afternoon, I'd decided on my strategy. At ten past, I found a callbox in Kensington, phoned the North London Echo, asking to speak to Roy Shelley. I went on hold to the sound of Marvin Gaye's 'Heard it Through the Grapevine', and it was about a minute before he finally came on the line.

'Dennis Milne. Fuck me, I haven't heard from you in a while. What do you want? Renew your subscription?'

'No, I might have something for you. Something that'll sell a lot of papers.'

'Oh yeah?'

'But I need something from you first.'

'You're not pissing me about, are you, Dennis? No disrespect, but I don't want to waste my time here. There's talk of redundancies at this place at the moment and I don't want to be first in the queue.'

'You'll be last in the queue if you run this story, Roy. It's big stuff, I promise you. The sort of stuff the nationals love.'

I could almost hear his interest cranking up at the other end. I'd known Roy Shelley a long time. He was what you'd call an old-school reporter. A pisshead who could sniff out information faster than any copper I knew.

'Can you give us a little snifter?' he asked. 'Just so I've got some sort of idea what to expect.'

'Not yet, but I promise you it'll be one hell of a lot better than you can imagine. It might even turn out to be the story of your career. But, like I said, I need something from you first.'

'What?' His tone was suspicious.

'Does the name Mehmet Illan mean anything to you?'

He thought about it for a moment. 'No. Should it?'

'I don't know. But can you do me a favour and find out anything you can about him? He's Turkish, I think.'

'Well, he would be with a name like that.'

'I would imagine he's based somewhere in North London, and he's definitely involved in a lot of dodgy dealing.'

'What kind of dodgy dealing?'

'I'm not a hundred per cent sure, but I think, if you ask around enough, you'll find people who know him. But try to be discreet.'

'And is this guy part of the story you've got?'

'He's a part of it, yes. But just a part. There's a lot more besides. How soon can you get me the info on him?'

'It could take a day or two.'

'Too long, Roy. I need it fast. The sooner I get it, the sooner you get your story.'

'Dennis, I don't even know who the bloke is.'

'Yeah, but you can find out. That's why I called you. I'm uncontactable at the moment, but I'll call you back at ten a.m. tomorrow. If you can get me the gen by then, I'd appreciate it.'

'This'd better be a good story, Dennis.'

'It is. I promise you. And something else too.'

'What?'

'Whatever you do, don't tell anyone I called. And don't make any attempt to get hold of me either. I can't explain why at the moment, but all will be revealed very shortly.'

'Christ Almighty, you're sounding like a fucking Robert Ludlum book. At least give me a sniff of what's going on.'

'Roy, if I could, I would. But I can't. Not for a day or two anyway. Just be patient. It'll be worth it.'

He started to ask another question, but I said my goodbyes and hung up.

After that, I made another phone call, but the person I was after wasn't in. No matter. It could wait.

I stepped out of the phone box and hailed a passing black cab. I got him to drop me off halfway up Upper Street, paid him his money, and went to pick up my car, which was parked on an adjoining street a couple of hundred yards up from my flat. I knew they'd be looking out for me on the off chance that I was stupid enough to return home, but they'd only have a couple of people watching the place, and my car was parked far enough away to avoid getting spotted. I was relieved to see that it was exactly where I'd left it more than a week earlier, which for London is pretty good going. It started first time, too. Maybe my luck was changing.

My first port of call was Camden Town. After hunting around for what seemed like a long time, I found a free meter on a residential street and then made my way over to Camden High Street to get my bearings before heading in the direction of Coleman House. I passed the pub where I'd first had a drink with Carla only a week earlier and, after hesitating for a moment, went inside. At this time in the afternoon it was still quiet, with only a sprinkling of students, old codgers, and the unemployable dotted about the place. That would all change in half an hour when the after-work crowd started to pour in.

I ordered a pint of Pride from the bar and asked the barman where the payphone was. He told me it was in the corridor leading to the toilets. There was no-one around when I walked in, so I dialled Coleman House reception.

'Carla Graham, please,' I asked in as official a voice as I could muster.

'She's not here at the moment,' said the voice at the other end, a woman whose tones I didn't recognize. 'Can I ask who's calling, please?'