Elder nodded slowly. ‘That’s bound to happen,’ he said. ‘Folks are always the same. But these’ll be city folks, no doubt. Students and such.’

‘Some of the keenest doggers,’ said Fry, ‘are lorry drivers.’

‘Eh?’

‘Lorry drivers. Truckers. They have favourite places where they like to park up for the night. I suppose they get bored just watching the telly in the back of the cab and eating microwaved chips. So they get together sometimes, have a few cans of beer, and go dogging. A bunch of big, hairy truckers can be a bit intimidating, and not quite what people are expecting. Things can get out of hand.’

‘Those will be long-distance drivers,’ said Elder. ‘Blokes doing a haul up to Scotland or somewhere. They’re miles away from home, you see. They have to stop where they can. Most of them are from the Continent these days – Germans and French and Italians. I saw one the other day from a place called Azerbaijan. I don’t even know where that is. I couldn’t find it on the map. A damn great Mercedes he was driving, too. Just think of it. Miles away from home. Miles and miles and miles.’

‘Not all of them are from the Continent, Mr Elder,’ said Fry. ‘Some of them aren’t far away from home at all.’

‘I don’t know what you mean.’

‘See this make and registration?’ said Fry, showing the note. ‘This DAF was recorded by one of our patrols as being parked at Godfrey’s Rough. It’s a local registration, Mr Elder. This lorry doesn’t belong to any Frenchman or Azerbaijani. It belongs to you.’

Fry paused the interview tapes again. Jack Elder was developing the classic breathless, bewildered look of the guilty person suddenly finding himself smothered under the weight of evidence that he’d either overlooked or had never imagined could exist.

‘We’ll take a break, shall we, Mr Elder? You can settle into your cell while we wait for the duty solicitor to arrive. It will probably be tomorrow when we can talk again. I hope you didn’t have plans for Christmas.’

Tom Farnham was only thirty-eight years old. He jogged a couple of miles through the woods whenever he had time, and he visited the gym about once a month. He was as fit as he wanted to be, for his age. Though he was struggling financially right now, he had lots of plans for future enterprises, when the time was right. Tom Farnham liked money.

When Farnham went out to his workshop that night, the wind had risen. He could hear a continuous rustling in the woods, as if the trees were whispering to each other, whispering secrets that ought to be kept quiet. It was still raining, and the trees were sodden. In these woods, the sound of dripping water could be mistaken for footsteps after a while.