‘He owns the land at the back of Bain House. But I think his farmhouse is way down there, two fields away.’

‘He’ll have a firearms certificate. Most farmers do – for a shotgun, at least. But maybe he has a serious rabbit problem and needs a rifle.’

‘Yes, and maybe he’s a retired SAS sniper,’ said Hitchens sceptically.

Kessen spun sharply on his heel. ‘Well, maybe he is. We don’t know that he isn’t, do we, Paul? This is a man who had the opportunity – the shots were fired from his property. No one would question Mr Cross driving over his own land, even at night. Perhaps no one would question him taking his rifle with him either.’

‘We don’t know that he has a rifle,’ persisted the DI.

‘He’s also the man who reported the open window at the back of the house,’ said Kessen, as if Hitchens hadn’t spoken. ‘Thereby ensuring that he was involved in the investigation as a witness. You know the typical behaviour, Paul.’

‘He was alerted by the postman that something might be wrong. That’s why he took a look.’

‘That doesn’t mean he wouldn’t have done it anyway, sooner or later. We don’t know, do we?’

‘We don’t know anything,’ said Hitchens.

‘That’s why we have to start by eliminating whoever we can get hold of locally. And we’ll see what that leads us to.’

‘What if he doesn’t admit to having a gun? We don’t have any justification for a search.’

‘We could ask him to co-operate with a gunshot residue test. At least we’d know if he’d fired a gun recently.’

Listening to the discussion between the detectives, Wayne Abbott shook his head. ‘Sorry, it’s too long since the shots were fired. A GSR test has to be done within the first few hours to get meaningful results. After forty-eight hours, any suspect will have washed and wiped his hands enough to have removed all detectable traces.’

‘A trace metal test to determine whether he’s held a firearm?’

‘Has to be within twenty-four hours.’

Kessen cursed quietly. ‘Twenty-four hours is useless to us. Useless.’

The DI pointed at his two detectives. ‘We’ve done the initial house-to-house, but the immediate neighbours will have to be interviewed properly. They must know something about Rose Shepherd. Take one of them each, will you? Someone will give you the names.’

‘Right, sir.’

‘A woman with no family and no friends,’ said Hitchens bitterly. ‘How can we reconstruct the life of someone like that?’

‘She must have had at least one enemy,’ said Fry. ‘That’s a start.’

‘It’s some kind of relationship, anyway.’