Then there was the field. That at least had yielded some tyre marks. How clear they were would depend on how soft the ground had been, whether it had rained before the incident, and what the weather had been like since. Cooper looked at his watch, and pictured DCI Kessen doing the same thing, cursing the delay in the body being found. There wouldn’t be much else in the field, of course. If there were no shell casings or footwear impressions, then there wouldn’t be any dropped matches or cigarette ends either. But the suspect’s car had been driven close to the edge of the field. A tiny flake of paintwork left on a branch of the hawthorn hedge, maybe? A bumper scraped on the corner of a stone wall? But in a fifty-acre field? From dark paintwork? Needles and haystacks came to mind.

The most useful scene might be the third one: the suspect’s vehicle. If they ever found it, of course. There should be fibres on the seats, fingerprints on the door handles, sweat stains on the gear stick.

Cooper turned at a sound in the garden. A squirrel ran across the lawn and scuffled among the dead leaves on the flower beds. It was burying nuts before hibernation time came. Across the garden, another squirrel chattered with that strange cry they had, somewhere between the call of a bird and the mew of a cat.

From what Diane Fry had said, Mr and Mrs Ridgeway would hate this, if they saw it. If they were breeding here, there’d be a continuous supply of them to raid her neighbours’ gardens.

Cooper was approaching the end of his shift. His DI seemed to have forgotten him, Fry had already left Foxlow, and no one had mentioned overtime. Tomorrow would be hectic, though. By then some lines of enquiry would have emerged. Suddenly, there would be an insatiable demand for resources, and everyone would be rushed off their feet. He might as well take advantage of the lull.

He walked back into the house. Downstairs, the rooms were full of people. He could hear them opening drawers, taking photographs, rustling papers, talking and laughing among themselves. There were probably more people inside Bain House at this moment than had been over the doorstep in the whole of the last year. If Rose Shepherd walked in now, she wouldn’t recognize the place. She’d be like a shocked parent who’d come home unexpectedly to find the teenage children had moved the furniture, rolled up the carpets, and thrown a party that got out of hand.

The image of her bewildered reaction brought Cooper to a halt as he remembered the fourth crime scene. At this moment it was lying in the mortuary, waiting to be examined for whatever information it could yield. It was Rose Shepherd’s body.