‘Hey! You’re paid to be here. It’s cost me good money,’ Hugh said, with the usual bloody smile that seemed to imply that the words were a joke. The smile that made Dougie feel like slapping him in the face, that was calculated to provoke violence. ‘In fact, I’m paying your wages.’ He looked around the table, in the hope of gathering support and an audience.

‘What were you doing in the bird room anyway?’ Ben demanded. ‘It’s not as if you’re a ringer. It’s not as if you do anything useful.’

‘I was using the computer. There was something I wanted to check out.’ For a moment the smile slipped. ‘If the police can’t find Angela’s murderer, I thought I’d do something. We can’t stay here for ever. I need to be moving on.’ The last words sounded like something from a bad Country and Western song and Dougie couldn’t help grinning.

Then Sandy Wilson, the second cop, the one who had been staying in the centre, stood up. He moved quite slowly, but still somehow he captured their attention.

‘Just sit down, boys.’ He spoke with an easy kind of voice. Like he knew what it was to lose his temper and it had never done him any good, so they’d do well to take notice of him. ‘It’s a tough time for everyone, trapped in here. But it won’t be for long now. It’ll soon be over.’

Dougie wondered if he had any reason for saying that, or if they were just words to calm the young men down. He thought Sandy was playing a dangerous game if he had no evidence to charge the murderer, because he was raising expectations and people would be even more frustrated if nobody was arrested. As it was, he supposed they were all under suspicion. It wouldn’t be easy, Dougie thought then, to find a kind and respectable girlfriend if she believed he might have stabbed two women.

After lunch, people scattered. Dougie had eaten far too much and after the exercise of the morning all he really wanted to do was rest. He liked to sit in the common room with a field guide and a cup of tea; soon he knew he’d be snoozing. But John Fowler was back there with his laptop and the sound of it, the staccato and irregular tap-tap of the keys, really got on Dougie’s nerves. Anyway, if this was going to be his last day maybe he should make the most of it and get out into the field.

He found Ben in the bird room. He was still angry, Dougie could tell. Still kind of smouldering.

‘Want some company on the trap round?’