"Couple of registration numbers I think might be involved. White transit vans both. The second one of them is Vinnie Butler's."

As I was walking to my car, a blue BMW pulled up outside the house and a petite, expensive-looking woman in her sixties with short auburn hair and a fur coat got out. She looked out over the council estate with pursed lips, including me in her dismayed sweep, then clipped up the drive of the Leonards' house. When the door opened, she ignored the children who had run to greet their granny and were frolicking around her legs, instead embracing Annalise and laying her daughter's head on her shoulder as if she were a wounded bird.

The broken bicycles and trashed stereo systems were strewn around the laneways and greens of Michael Davitt Gardens, a sure sign Christmas was on its way. Some houses had gigantic inflatable Santas and Rudolphs in their tiny gardens; some had flashing lights on their roofs, or tinsel and spray snow decorations in their windows; some were boarded up with bolts on their electricity meters. The pavements were carpeted with dog shit and broken glass; pizza boxes and fast-food wrappers festooned the gates and boundary walls; old trainers and plastic bottles filled with gravel hung on cords lassoed around telephone wires. There was nothing breathing on the street save for a few sullen dogs.

The two reg plates Leonard had given me were both for white Ford Transit vans; I had already spotted half a dozen on the estate; it was the vehicle of choice for plasterers, roofers, any tradesmen who had to carry a lot of bulky materials around with them, alongside anyone who, strictly speaking, wasn't a qualified tradesman at all, but who fancied his chances quoting low for a building job, completing half or three-quarters of it badly and then doing a bunk, or robbing your house and driving away with all you own, furniture and appliances included. Their drivers cut you off on the roads, and they let their kids ride up front in the cabin without seat belts, let alone car seats; they felt invincible in their white metal crates and drove accordingly. I didn't like white Ford Transit vans and now I was parked four doors away from Vinnie Butler's, trying not to look conspicuous in a forty-two-year-old Volvo with RIP scraped on the hood. I might have been many things, but at least I wasn't the cops.

Kids were drifting onto the streets: soon they'd be all over me, or at least, my car; not for the first time, I questioned the stupidity of driving a conversation piece, particularly when I didn't have any of the lingo: if something went wrong with it, I called Tommy; his telephone number was the extent of my auto know-how. I called Tommy now to see what he knew of the Butlers. His phone went straight to voice mail, so I left a message. Tommy was a reliable guide to the dodgier citizens in south Dublin and north Wicklow, not least because he'd invariably had dodgy business dealings with all of them at one time or another.

I waited fifteen minutes, half an hour, an hour, reading the same headlines over and over in yesterday's Irish Times and trying to ignore the three young lads across the way from me playing street hurling with a tennis ball. That's how I almost missed Vinnie Butler: when the ball smacked off my windshield, I turned to see the lads scarpering around the corner; when I turned back, Vinnie Butler's Transit van was pulling away from the curb. I pulled out after him, drew up behind the van at the junction that led from the estate out onto the main road, and tailed it onto the N11 and south for a few miles until it turned off past Newtown and headed west toward Roundwood.

Pine and fir trees flanked the road like troops massing for battle as we drove into the low winter sun's glare. I kept my distance, and when the white van took a right up a small track with a makeshift signpost reading CHRISTMAS TREES, about a mile or so from the Vartry Reservoir, I kept going until I came to a lay-by maybe three hundred yards farther up the road but still in sight of the turn. I got out of the car, produced a notebook and a pair of Meade 10 x 25 compact binoculars and made a moderate show of casting about as if I were interested in the wildlife, although nothing wheeled across the skies but magpies and sparrows.

About twenty minutes later the van piled out of the turn and I caught a brief glimpse of Vinnie Butler: burly, weathered complexion, tiny eyes, close-cropped brown hair. He tossed a fast-food carton and a soft-drink container and the colorful bag they'd come in out the window, flicked a cigarette butt after, anointed the lot with a gob of spit and hauled the Ford Transit back in the direction it had come.

My phone bleeped: Tommy had left a voice mail. He said, "The Butlers eat their young. They're a tribe of savages, Ed: cross one and ten'll come after you. The women are worse than the men, but it's not always easy to tell them apart. Vinnie is thick as shit, but he's vicious with it. They're caught up in any number of feuds over horses, cars, you name it. They sorted the last one out by burning a young one's face with acid. No amount of money is worth messing with the Butlers. Just walk the fuck away."

After that, I had little option but to check out what Vinnie Butler had been up to in the woods. The track he had exited led up to the edge of another encampment of fir trees, their serried ranks deepening in hue with the fading winter light, and then weaved back and down toward an old corrugated barn and a set of outbuildings; I couldn't see a farmhouse, but the fields ahead were fenced and cows and sheep were grazing; I breathed a tumult of manure and aging hay and fermenting compost; in the nearest field, an old blood bay was munching steadily on damp grass. A half-dozen freshly cut fir trees were propped up by the barn. Maybe Vinnie Butler hadn't come to dump his trash; maybe he had had legitimate business with the farmer; maybe he had come to buy a Christmas tree; after all, he had waited until he got back to the road before he tossed his lunch bag.

I turned and drove slowly back around, stopping when I reached a five-bar gate that opened onto a clearing wide enough to let a van drive through the forest; it was recessed at a sharp angle from the track and concealed by a modest platoon of pines; I had missed it completely on my way up, and I spotted it now only because I was looking for it-and because a white refuse sack clung to one of the trees. I tucked the Volvo behind the pines and climbed over the gate, which was padlocked and chained.

Well-worn tire tracks sparkled bright as metal in the hard earth as I walked through the forest. Pine resin initially chased away the farmyard aroma; after about ten minutes the fresh smell receded; by the time I reached the dump, I'd've cheerfully stuck my head in a compost heap rather than breathe the rank air that surrounded it. A hole about thirty feet in diameter had been dug and the earth banked up the sides; piled high within were bags of domestic waste: rotting food, soiled nappies, detergent and bleach and paint. A halo of flies hovered above the garbage, humming, and there was the rustle and snap of foraging birds and rats; great crows hung in the nearby trees.

On the far side, I could see the gleam of the reservoir water, and was drawn toward it. The edge of the dump was no more than fifteen feet from the shore. The reservoir supplied a substantial portion of the city's water. At least I'd have something for Joe Leonard that no council official or Guard could ignore. I took a few photographs and then climbed up the bank nearest the water to see if I could find some personal traces among the trash: a utility bill or two would be enough to nail at least some of the people involved.

I put on the surgical gloves I always carry and a set of shoe covers I'd packed because I figured the job might get dirty. I waved a scum of flies away and selected the driest-looking bag I could see, which was full of old magazines, and pulled it to one side and uncovered a bag of cast-off clothes, most of them children's; mixed in were a few broken plastic toys and two empty vodka bottles. Beside that I could see the top of a bag of shoes.