Not unnaturally, I couldn't sleep. When light started to filter through the curtains, I gave up: I would go in to work early, I decided, see if I could find anything that would tell me what Cassie had said to Rosalind, start preparing the file on Damien to send to the prosecutor's office. But it was still raining hard, traffic was already bumper to bumper, and of course the Land Rover threw a flat tire halfway down Merrion Road and I had to pull over and fumble about changing it, with rain pouring down my collar and all the drivers behind me leaning irately on their horns as if they would actually have been getting somewhere if it hadn't been for me. I finally slapped my flasher on the roof, which shut most of them up.

It was almost eight o'clock when I made it into work. The phone, inevitably, rang just as I took off my coat. "Incident room, Ryan," I said irritably. I was wet and cold and fed up and I wanted to go home and have a long bath and a hot whiskey; I did not want to deal with whoever this was.

"Get the fuck in here," said O'Kelly. "Now." And he hung up.

My body understood first: I went cold all over, my breastbone tightened and it was hard to breathe. I don't know how I knew. It was obvious that I was in trouble: if O'Kelly just wants your basic chat, he sticks his head in the door, barks, "Ryan, Maddox, my office," and disappears again, to be in place behind his desk by the time you can follow. Phone summonses are reserved for when you are in for a bollocking. It could have been anything, of course-a great tip I had missed, Jonathan Devlin complaining about my bedside manner, Sam pissing off the wrong politician; but I knew it wasn't.

O'Kelly was standing up, his back to the window and his fists jammed into his pockets. "Adam fucking Ryan," he said. "And it didn't occur to you that this was something I should know?"

I was engulfed by a wave of terrible, searing shame. My face burned. I hadn't felt it since school, this utter, crushing humiliation, the hollow clutch of your stomach when you know beyond any doubt you've been caught, snared, and there is absolutely nothing you can say to deny it or get out of it or make it any better. I stared at the side of O'Kelly's desk and tried to find pictures in the grain of the fake wood, like a doomed schoolboy waiting for the cane to come out. I had thought of my silence as some gesture of proud, lonely independence, something some weatherbeaten Clint Eastwood character would have done, and for the first time I saw it for what it essentially was: shortsighted and juvenile and traitorous and stupid, stupid, stupid.

"Do you have any idea of the extent to which you may have fucked up this investigation?" O'Kelly asked coldly. He always becomes more eloquent when he's angry, another reason I think he's brighter than he pretends to be. "Have a quick think about what a good defense attorney could do with this, just on the off-chance that it ever gets as far as a courtroom. A lead detective who was the only eyewitness and the only surviving victim in an unsolved related case-Jesus Christ. While the rest of us dream about pussy, defense attorneys dream about detectives like you. They can accuse you of anything from being incapable of running an unbiased investigation through being a potential suspect in one or both cases yourself. The media and the conspiracy shower and the anti-Garda mob will go wild. Within a week, not one person in the country will remember who's supposed to be on trial here."

I stared at him. The sucker punch, coming out of nowhere while I was still reeling from being found out, left me stunned and speechless. This will seem incredible, but I swear it had never occurred to me, not once in twenty years, that I could be a suspect in Peter and Jamie's disappearance. There was nothing like that in the file, nothing. Ireland's 1984 belonged more to Rousseau than to Orwell; children were innocents, fresh from God's hand, it would have been an outrage against nature to suggest that they could be murderers as well. Nowadays, we all know there is no such thing as too young to kill. I was big for twelve, I had someone else's blood in my shoes, puberty is a strange slippery unbalanced time. Suddenly and clearly I saw Cassie's face, the day she came back from talking to Kiernan: that tiny twist to the corners of her mouth that said she was keeping something back. I needed to sit down.

"Every guy you've put away will demand a retrial on the basis that you have a record of withholding material evidence. Congratulations, Ryan: you just fucked up every case you've ever touched."

"I'm off the case, then," I said finally and stupidly. My lips felt numb. I had a sudden hallucinatory image of dozens of journalists yapping and screeching at the door of my apartment building, shoving microphones in my face and calling me Adam and demanding gory details. Heather would love it: enough melodrama and martyrdom to keep her going for months. Jesus.

"No, you're not off the fucking case," O'Kelly snapped. "You're not off the fucking case purely because I don't want any smart-arse reporter getting curious about why I gave you the boot. The word from now on is damage control. You don't interview a single witness, you don't touch a single piece of evidence, you sit at your desk and try not to make anything any worse than it already is. We do everything we can to stop this getting out. And the day Donnelly's trial is over, if there ever is a trial, you're suspended from the squad pending investigation."

All I could think was that "damage control" was two words. "Sir, I'm so sorry," I said, which seemed like a better thing to say. I had no idea what suspension involved. I had a fleeting image of some TV cop slapping his badge and his gun on his boss's desk, close-up fading to credits as his career went up in smoke.

"That and two quid will get you a cup of coffee," O'Kelly said flatly. "Sort the tips from the hotline and put them on file. Any of them mention the old case, you don't even finish reading them, you pass them straight to Maddox or O'Neill." He sat down at his desk, picked up the phone and started dialing. I stood there staring at him for a few seconds before I realized I was supposed to leave.

I went slowly back to the incident room-I'm not sure why, I had no intention of doing anything with the hotline tips; I suppose I must have been on autopilot. Cassie was sitting in front of the VCR, her elbows on her knees, watching the tape of me interrogating Damien. There was an exhausted slump to her shoulders; the remote control dangled limply from one hand.

Something deep inside me gave a horrible, sick lurch. It hadn't even occurred to me, until that moment, to wonder how O'Kelly knew. It only hit me then, as I stood in the doorway of the incident room looking at her: there was only one way he could possibly have found out.

I was perfectly aware that I had been pretty shitty to Cassie lately-although I would argue that the situation was a complex one, and that I had my reasons. But nothing I had done to her, nothing I could do in the world, warranted this. I had never imagined this kind of betrayal. Hell hath no fury. I thought my legs were going to give way.

Maybe I made some involuntary sound or movement, I don't know, but Cassie turned sharply in her chair and stared at me. After a second she hit Stop and put down the remote. "What did O'Kelly say?"

She knew; she already knew, and my final spark of doubt sank into something jagged and impossibly heavy dragging at my solar plexus. "As soon as the case is over, I'm suspended," I said flatly. My voice sounded like someone else's.

Cassie's eyes widened, horrified. "Oh, shit," she said. "Oh, shit, Rob…But you're not out? He didn't-he didn't fire you or anything?"