That idea, though, had made him look at Diane Fry differently. If it was true about funeral directors, then what about a police officer? Someone who dealt with nothing but murder cases and rapes, and serious violent crimes? Were they also sociopaths who just happened to have found themselves a profession where their personality disorder was an advantage? No one wanted a cop who empathised too much. It made them less professional, not so good at their jobs.

Cooper shivered with cold and knew it was time to go home. He stood up suddenly, startling the ducks and making them rattle their wings in the darkness.

No, he had never been able to achieve that level of detachment himself. No amount of trying got him to a position where he could create that protective façade. He’d become convinced this was what might prevent him from moving up the promotion ladder in the police service. It was the Diane Frys they wanted these days.

But then he recalled the new version of Diane he’d encountered in her flat on Friday night. The softer, more relaxed Fry. The one who actually asked him for a favour. Was this the same person? Could it be the woman he’d always suspected might exist behind the brittle exterior?

If so, this new Diane Fry was like a glimpse of some illusory oasis, glittering in the distance but defying the most determined traveller to reach it. The nearer he got, the further away she would seem. It felt inevitable, the story of his life. It was certainly the story of his relationship with Fry.

The ducks quacked quietly in agreement as he walked away from the peace of the river and headed back towards the town.

While Ben Cooper sat by the riverside in Edendale, Luke Irvine was in the pub. His date hadn’t gone too well the night before. No matter how often he checked his phone, there were no text messages. So he couldn’t imagine she was expecting to hear from him again tonight. But that seemed to be the story of his life at the moment. Opportunities came along, but were allowed to escape.

As he watched the other customers in the bar of the Angler’s Rest, Irvine knew that Ben Cooper would still be out asking questions about the woman whose body had been found at Hollins Bridge. Overtime meant nothing to his DS. Though he admired Cooper in lots of ways, Irvine hoped he never ended up like that himself. Dedication to the job was great, but it was so much better to have a life away from the office.

Irvine lived in the village of Bamford, between the Hope Valley and the Upper Derwent. It was a short drive over the hill to Edendale, but quiet enough to give him the village life he’d grown up with in West Yorkshire.

A man he knew vaguely from a few houses down the road came and sat down on a vacant seat nearby. He nodded and said, ‘Hi’. Irvine acknowledged him cautiously. Conversations in the pub could be difficult, he’d discovered.

‘Good to see the place so busy,’ said the man.

‘Yeah, great.’

‘It just goes to show.’

‘You’re right, it does.’

Irvine took a swig of his beer, holding the bottle to his mouth a bit longer than was strictly necessary. He knew what the man was talking about, without any telling.

People in his community had spent months raising the money to buy their village pub. They formed a cooperative society to take ownership of the building, with hundreds of residents buying shares. They successfully applied to get the pub registered as an ‘asset of community value’ under the government’s new Localism Act. They drew up a business plan, outlining a scheme for a community hub with a café and shop, and accommodation for visitors. Their village post office was due to close too and they negotiated to move counter services into the pub. They appeared in the local media, manned stalls at shows and fêtes, and enough money came in to make the dream possible.

For a while it had all seemed to be going well. With the financial targets hit, solicitors were instructed to begin the conveyancing process. But on the same day the company that owned the pub announced it was exchanging contracts with a third party – a developer who would make the deal pay by building houses on the car park.

Irvine remembered calling into the pub one night for a drink when the news had just broken. The mood was disturbing. Everyone he spoke to was frustrated and angry, convinced they had been betrayed by big business and exploited for a quick profit.

One of his neighbours, who’d had a couple of drinks too many, buttonholed him at the bar while he was ordering a bottle of Thornbridge Sour Brown. Like a doctor, Irvine found he could never escape the fact that he was a police officer, even when he was off duty. In fact, it had been worse since he joined CID and became a detective. Everyone wanted to hear gory details of cases, tell him their theories, or ask him for clandestine forms of assistance that would undoubtedly lose him his job.

That night, though, there was only one topic of conversation. The last-minute betrayal over the sale of the pub had turned people’s minds to committing crime rather than solving it.

‘This could definitely be a motive for murder,’ this same neighbour had said, leaning close to him at the bar. ‘With a hundred and eighty-five potential suspects at the last count. They might all commit the crime together, like the plot of an Agatha Christie story.’

‘By far the least believable Christie plot,’ said Irvine, who had watched Poirot on TV.

The man tapped the side of his nose and almost winked. ‘Where there’s a motive, people will find a means.’

But a week or two later the public outcry against the decision had changed the minds of both the pub’s owners and the potential buyer. The project went ahead and Bamford owned its community hub. When he went into the Angler’s Rest now for a Sour Brown, people again asked for gory details or the kind of assistance that would lose him his job.

‘I suppose you’re involved in that case over near Buxton,’ said the man now, with an inquisitive lift of the eyebrows.

‘Maybe so.’

But as Irvine looked at his neighbour, he recalled that earlier conversation. An Agatha Christie plot? He wondered if he should phone Ben Cooper right now with the interesting idea that had just come into his head.

But of course not. Unlike Cooper, he had a life after all.

‘Do you fancy another drink, mate?’ he said.

21

Sunday 3 November

Carol Villiers had produced a list of names and it was waiting for Cooper on his desk when he arrived in the CID room on Sunday morning. He wasn’t supposed to be on duty, but there was nothing for him to do at home. It was a choice between being here and painting shelves in the shop. No contest. He loved his brother, but the thought of spending all day working with Matt filled him with dread.

The list Villiers had drawn up contained the names of all the residents of Bowden, plus Sandra Blair and her husband Gary, who were former residents, and those of Jason Shaw and the Nadens.

After a moment’s thought, Cooper added Rob Beresford and his parents to the list. Was there anyone else he should consider? No, that seemed to be about it.

Cooper glanced through the list again. There were quite a few familiar surnames on it. That was inevitable, after all his years in E Division making arrests, interviewing suspects, reading intelligence files on known criminal associates. Certain family names cropped up time and time again. Others he remembered particularly after just one meeting – an individual could make such a deep impression on him he would never forget them for as long as he lived. There were even one or two who’d been helpful to him in the past and who might not run a mile when they saw him coming.