Mark Roper was moving cautiously across the slopes of dying heather, placing his boots on the bare surface of the rabbit tracks to avoid the snap of dead stems. The spring of the peat underfoot felt like a welcoming response from the earth to his presence, the clutch of brittle foliage at his trousers like the touch of a friend. He had already been waiting for an hour. But none of the men Mark had been watching had seen him as he stood above them in the birches up the hill. Mark had left his red jacket at home today, and he had long since learned the art of being inconspicuous. He had also been prepared to wait as long as necessary for the policemen to leave.

He knew the two men were detectives, because he recognized one of them from Sunday, when they had questioned him. It was the one called Cooper. Mark had seen him again, with a woman, when he had talked to Yvonne Leach. This detective was young, and you could tell he was local. He was the one who lacked the hard-eyed aggressiveness that Mark had seen in the other policemen. In fact, he could almost have been a Ranger. This detective, Cooper, was also the one who had made Mark think of what his own brother would have looked like by now – if he had still been alive.

Finally, the two policemen had driven away down the track from Ringham Edge Farm. Perhaps they were heading back to the cycle hire centre, where the car park was full of police vehicles this morning and the first visitors of the day were getting an unpleasant surprise as they unloaded their mountain bikes and strapped on their cycling helmets.

Just over the shoulder of Ringham Moor were the Nine Virgins. And up there, Mark knew there would be more police, keeping the public away from the stone circle, like priests guarding an altar from the profane.

A hundred yards along the slope of the hill, Owen Fox was working on the boundary wall. There was still a lot to be done on the wall, and the Area Ranger would probably work on right through the day until the light started to go.

As Mark watched, Owen pulled on his gloves and picked up the new Pennine walling hammer he had bought only a few weeks before. It was a three-pound hammer with a sharp cutting edge fixed at a right angle to the shaft – a tool designed to slice the corners off the stones, so that only blunt edges protruded from the wall, leaving it solid and safe. Sometimes, Mark wished he could ask Owen to use his hammer and shape the rest of the world like that – with no sharp edges that could pierce the skin of his emotions or rip the protective veneer from his memories.