But Nelson does not notice his surroundings; he is thinking of a bleak coastline, of bodies washed out to sea by a relentless tide, of the circumstances in which he met Ruth Galloway. She had been the forensic archaeologist called in when human bones were found on the Saltmarsh, a desolate spot on the North Norfolk coast. Though those bones had turned out to be over two thousand years old, Ruth had subsequently become involved in a much more recent case, that of a five-year-old girl, abducted, believed murdered. He hasn’t seen Ruth since the case ended three months ago.

At the top of the hill all he can see is more hills. The only features of interest are some earthworks in the distance, and two figures walking along the top of a curving bank: one a brown-haired woman in loose, dark clothes, the other a tall man in mud-stained jeans. A cider-drinker, he’ll be bound.

‘Ruth,’ calls Nelson. He can see her smile; she has a remarkably lovely smile, not that he would ever tell her so.

‘Nelson!’ She looks good too, he thinks, her eyes bright, her cheeks pink with exercise. She hasn’t lost any weight though and he realises that he would have been rather disappointed if she had.

‘What are you doing here?’ asks Ruth. They don’t kiss or even shake hands but both are grinning broadly.

‘Had a case conference nearby. Heard there was a dig here.’

‘What, are you watching Time Team now?’

‘My favourite viewing.’

Ruth smiles sceptically and introduces her companion. ‘This is Dr Max Grey from Sussex University. He’s in charge of the dig. Max, this is DCI Nelson.’

The man, Max, looks up in surprise. Nelson himself is aware that his title sounds incongruous in the golden evening. Crime happens, even here, Nelson tells Max Grey silently. Academics are never keen on the police.

But Dr Grey manages a smile. ‘Are you interested in archaeology, DCI Nelson?’