Like everyone else, he’d been taught that rigor mortis in a dead body was complete by twelve hours and gone by thirty-six. But later he’d discovered that there were as many differences of opinion as there were experts, and too many factors involved. Time of death should be based on witness reports, not physical evidence. But he hadn’t heard a hint of any witnesses yet.

‘Surely we can send FSU home?’ said Hitchens. ‘Whoever did the shooting will be long gone.’

‘Not until we’ve completed a sweep of the area and done door-to-door in the village,’ said Kessen. ‘For all we know, he might be holed up somewhere nearby.’

‘Yes, understood. It just seems to be making the residents a bit jittery, seeing armed police officers on the street. They’re not used to it around here.’

Kessen shrugged. ‘Point of entry, Wayne?’ he said. ‘On the face of it, this open window looks like the way the assailant came into the house.’

‘Perhaps. But it wasn’t forced – there are no tool marks on the frame. We lifted several latents, though. I should get results on those within the hour.’

‘The first officers to arrive came in through a side window,’ said Hitchens. ‘But they had to smash it themselves, which set off the intruder alarms – Control got a call from a monitoring room somewhere, but we were already on the scene by then. The alarms were still going like crazy when I got here.’

‘Our officers set off the alarms? They weren’t activated by the assailant?’

‘No, sir.’

Kessen walked out on to the landing and looked down the stairs. A SOCO was crouched over something in the hallway.

‘What have you got there?’

‘A video intercom system. It must be connected to the unit on the front gate.’

Hitchens came over to look. ‘I don’t even have a gate at my house, let alone an intercom. I live on one of those open-plan estates. Any bugger can run across my front lawn, or up my drive.’

‘They call that community living,’ said Abbott.

‘I know what I’d call it. So how does that thing work?’

The SOCO picked up the handset. ‘When someone presses the button at the gate, there’s a tiny camera in the unit on the gatepost that shows their image on the screen here.’

‘So the householder can see the postman in the flesh, and know he’s not an impostor.’

‘That’s it.’

Cooper looked down at the body again as the exchange went backwards and forwards around him. Voices echoed strangely in the house, as if it wasn’t fully furnished. Actually, the furniture was fairly sparse. Nothing unnecessary or frivolous cluttered the rooms that he’d seen. It made him think of his flat in Welbeck Street when he’d first viewed it. Furnished, but empty. Empty because no one lived there.