Perez knew Sandy was right, but he thought the murderer was a man. The victims were women. But perhaps he just didn’t want to believe in a female killer. He followed Sandy away from the trap.

‘There was a bit of a ruckus at lunchtime.’ Sandy stepped across the ditch and on to the road, then began to walk back to the car. ‘Ben and Hugh. I thought it might come to blows.’ He opened the passenger door and got in.

‘What was it about?’

Sandy shrugged. Perez could see the droplets of rain on his jacket, smelled wet wool. ‘Something and nothing. Hugh had left the bird room in a mess and Ben had a go. He’s an arrogant bastard though, that Hugh. None of them seem to like him much.’

‘A scapegoat, maybe,’ Perez said. ‘They all want someone to hate and he’s starting to get on their nerves.’

Sandy turned his head quickly. ‘Like The Lord of the Flies?’

Sandy could always surprise him. ‘Aye, something like that.’

‘We did it for English Highers,’ Sandy said. He paused, while Perez started the engine. ‘Everyone staying in the North Light knows that one of them is a murderer. They’d like it to be Hugh. He’s the loner really, isn’t he? I mean, he puts on the charm, but he hasn’t got any real friends there.’

Perez supposed that was true. The Fowlers had each other, John’s calm and Sarah’s anxiety meeting the other’s need. Dougie had been coming to the field centre for so many years that he was something of an institution. Maurice and Ben had worked together all season. Nobody knew Hugh. All they had were the stories he told about himself and now his humour was probably wearing a bit thin. And all I have is the stories he’s told about himself. Perez pictured Fran as he’d last seen her, sitting in the centre kitchen chatting to Hugh. It was time to get her away from the lighthouse and back to the safety of Springfield. He thought he should spend some time at home this evening. His mother would have prepared a special supper. They might even get an early night.

Am I like the other field centre residents? Would I prefer Hugh Shaw to be the murderer? Because Perez realized that he too disliked Shaw; the dislike hit him now with a surprising intensity.

They’d just started the drive north when Sandy’s mobile rang. Perez pulled into the side of the road, so he could take the call without risk of losing reception. He couldn’t hear the other end of the conversation but he could tell Sandy was excited. ‘Sure? Yeah, thanks. You’re brilliant. I definitely owe you a few drinks next time we’re in town. But keep it to yourself, yeah?’