I had another large Jameson before I left the pub, but it didn't do a lot to get the chill out of my bones. By the time I reached Michael Davitt Gardens, there were marked and unmarked Garda cars flanking the white Ford Transit van; kids climbed on walls and shinned up lampposts and neighbors stood in their doorways and gardens and watched as the crop-haired driver with the red face was led into a squad car. I drove on and parked around the other side of the estate, across the road from the closed gates of the Leonard house. The blue BMW was still parked outside. I called Joe Leonard on his mobile and he came out and sat in my car and I gave him a potted account of what had happened, up to the arrest of Vinnie Butler. Part of me felt relieved, as if the discovery in the woods had restored pride and dignity to us both: a trivial litter problem had become, or was at least on nodding terms with, a murder case. I don't think Leonard saw it that way.

"If they charge him for murder, will they let the dumping offenses slide?" he said.

I looked to see if he was serious. He was: deadly.

"Probably," I said.

"Well, in that case, I'll keep the camera rolling, Mr. Loy. You'll keep me posted if there are any developments, won't you?"

I said I would, and he got out of the car and crossed as far as the BMW, stroked the blue hood with his hand, then came back and leaned into my window.

"I know you didn't see us at our best this morning," he said quietly, blushing and looking back quickly and furtively at the upstairs windows of his house, as if his wife and her mother might appear in one of them to spy on him, characters all in a not terribly comic opera.

"It's just that I…I had a run of bad luck a few years back…a dot-com start-up, and…and we lost our house, repossession, right when the boom was taking off…and, well, it's been hard getting started again…the kids were so young when it happened. And Annalise was pretty angry…still is, really, don't suppose you can blame her, I asked her to trust me…we lost so much. We'd be sitting on a lot of equity now, instead of…"

He gestured around at his surroundings. I made a face intended to suggest that these kinds of things happened (which they did) and that often it was no fault of the person to whom they happened (which it wasn't) and that I was sure nothing but good would come of it eventually (which it might). I caught sight of my expression in the rearview mirror. It didn't reassure me. But Leonard didn't notice, or didn't mind; he simply wanted me to hear him out. I nodded and shrugged in a what-can-you-do sort of way, and he thanked me-for what, I couldn't tell-and straightened up and shook my hand and crossed the road, stopping to stroke the hood of the BMW again as he passed.

ACCORDING TO FATHER Vincent Tyrrell, Patrick Hutton's last known address was a town house in Riverside Village, a private estate by the Dodder River in Sandymount. Before I left the pub I had tried the two Patrick Huttons I could find in the phone book. One was a plasterer; the other was the senior executive solicitor at South Dublin County Council. Neither had been a jockey; the plasterer sounded amused at the suggestion, the solicitor mysteriously outraged, as if I'd accused him of being a sex criminal, or a DJ. Now I was driving north toward the city, the roads clogged with traffic on the last shopping Sunday before Christmas. I crossed the railway line at the Merrion Gates and took Strand Road for about a mile, then turned off into Sandymount. There was a video store on the green that offered Internet access, so I parked by O'Reilly's pub and waited in line for the single computer terminal behind two Italian students.

When it was my turn, I entered Patrick Hutton's name in a search engine. Amid the university professors, secondary school headmasters and orthopedic surgeons, I found a few references to Patrick Hutton the jockey, chief among them the following short piece in the Irish Independent in December 2004.

REWARD OFFERED FOR MISSING JOCKEY

Trainer F. X. Tyrrell is offering ten thousand euro for information about the whereabouts of Patrick Hutton, the Wicklow-born jockey who apparently vanished seven years ago. Hutton, who rode over a dozen winners for Tyrrell during 1996, including the Arkle Chase at Cheltenham on By Your Leave, dropped out of public view days before he was due to ride for Tyrrell at the Leopardstown Christmas Festival, and hasn't been seen since. Anyone with information should contact Derek Rowan, head man at Tyrrellscourt.

There was a small black-and-white head shot, but it was difficult to pick out any distinguishing features: like models, with whom they have a lot in common, jockeys all tend to resemble one another at first or even second flush. There were a few contemporary reports of races Hutton had run; the only other item of interest was a short account of a meeting at Thurles in October 1996, where By Your Leave finished last in a field of nine in the third race, and the subsequent inquiry at the Turf Club, where the question of Hutton deliberately stopping the horse was raised, but then dismissed.

I spent some time trying to find out a bit more about F. X. Tyrrell. There was plenty on his achievements in racing and breeding, but relatively little on the man himself: one marriage, which lasted ten years; no kids; usually accompanied in public by his sister, Regina. Legendarily reluctant to speak to reporters, so little was known about his life away from the track and the stud that it was logical to assume he didn't have any. I copied down one quote from an interview, the only utterance of his that involved a subordinate clause: "It's a simple game: it's all in the breeding, all in the blood. If the bloodlines are right, the animals will be right, provided they're given the nurture they need. Blood and breed, that's the beginning and end of it."

It was dark by the time I got to Riverside Village; the Christmas decorations were more discreet and tasteful than they had been in Michael Davitt Gardens: hardly surprising, as an 800-square-feet three-bed went for nine hundred thousand here in Dublin 4; number 20 had a lighted candle in the window and a holly wreath on the doorknob and a red 1988 Porsche 928 in the drive. My phone rang as I pressed the bell; when I checked the number and saw the 310 area code, I realized it was my ex-wife again. Nine in the morning in West L.A. and she could think of nothing better to do than call me. I felt a momentary stab of panic, but that gave way to the sad knowledge that there was no longer anything between us to panic about, and then to anger at her unwillingness to leave me the fuck alone. And that gave way to genuine panic, because when the door of number 20 opened, there was the dark hair, the pale skin, the great dark eyes, the long legs, the slightly crooked, wide red lips of my ex-wife standing before me.

I WAS SITTING on the black leather couch in the living room. I had asked for a whiskey, and was told I could only have one if I drank a cup of hot sweet tea first, so that's what I was doing while the woman who looked like my ex-wife sat on the black leather chair across from me. Her name was Miranda Hart, and whether she was uneasy or excited at having a strange man in her house, or both, I couldn't tell; her way of dealing with it to was to laugh a little, and smile a lot, and chew her gum vigorously; she was doing all three now.

I hadn't exactly fainted, but I had swayed a little out there on the doorstep, unsteady on my feet, clutching the door frame as the woman I thought was my ex-wife tried to shut the door on my hand, and then my scalp had sparked with sweat, and my tongue felt too large for my mouth, and I knew I was going to be sick. And had I not managed to blurt out Patrick Hutton's name, I would never have been let past the door, let alone allowed to use the bathroom to throw up, and then wash my face, and now sit by the fire in the living room with the dark burgundy and racing-green walls and the dark wood floorboards and the paintings and framed photographs of horses and jockeys on the walls and ask my questions. Because Miranda Hart was Patrick Hutton's widow.