There was also a sketch plan done by one of the SOCOs, complete with arrows indicating the points of the compass. It confirmed what Cooper had noticed at the site: the feet of the victim had been pointing to the east and the head to the west.

He had a feeling there was some significance in that alignment. It was one of those half-remembered things, a vague superstition in the back of his mind. He couldn’t have said who had put the idea in his head, or when. Maybe it was only something he’d overheard as a child, a whispered conversation among elderly relatives at a funeral, a bit of local folklore.

East to west. Yes, there was some significance, he was sure. But the alignment of the body was just as likely to be a coincidence, wasn’t it?

From the fragments collected at the scene, the dead woman seemed to have been wearing a rather plain, light blue dress, underwear, tights and blue strappy shoes with one-inch heels. No coat, nothing worn outside the dress. It was unlikely that she’d walked down to the stream at Litton Foot herself, but not impossible.

The skeleton had been incomplete when it was found, with several small bones missing. And there was no jewellery that might have been used for identification. No engraved bracelets, no wedding ring. This woman had been someone’s daughter and mother. But had she been someone’s wife, too?

Cooper knew he might never be able to get a lead on how the woman had died. Not from the remains, at least. Forensics could perform wonders, but not miracles.

And there was the question of what had happened to Jane Raven Lee’s body after her death. The possibilities were bothering him. The dead woman hadn’t been buried, she’d been laid out and exposed to the elements. The whole thing had too much ritual about it. Cooper wished there was someone on hand who could tell him whether he was discerning a significant fact, or just imagining things again.

The evening briefing didn’t last long. There wasn’t much to report, after all. A forensic examination of the scene had found no signs of a struggle near Sandra Birley’s car, which suggested her abductor had given her no chance to make a run for it, and had probably used a weapon to subdue her quickly. The Skoda had still been locked, and there was no sign of the keys.

The concrete floor of a multi-storey car park was hell for a fingertip search. Who could say whether an item found on the oil-stained surface had been dropped by Sandra Birley, her attacker, or one of a thousand other people who had used Level 8 in the past few weeks? Scores of fibres had been recovered from the retaining wall and the ramp barrier. Partial footwear impressions were numberless. And the SOCOs had collected enough small change to pay their coffee fund for a week.

‘One question I’d like answered,’ said DCI Kessen, ‘is whether our man knew which CCTV cameras were dummies, and which weren’t. And if so, how? There’s no way of telling just by looking at them, is there?’