Hugh gave a little shrug. ‘I didn’t know for certain.’ He must have been aware that Perez looked up at him, stared at him very hard, but he didn’t show it. From the beginning he hadn’t acknowledged that Perez was there. ‘Besides, as you said, I’d committed blackmail. Not something I was going to own up to.’

‘So it wasn’t that you considered Fowler another target?’ Sandy said. ‘Angela was dead, she was no more use to you, but Fowler . . . He’d committed murder. He’d go on paying for the rest of his life as long as he was free.’

The smile returned. ‘Really, Sandy, that’s guesswork isn’t it? Speculation. You’ll never ever know.’

Ben Catchpole had a graze over his eye, covered by a sticking plaster. He saw Perez immediately and made a move to go over. He would have offered his condolences, said kind words about Fran, but something in the detective’s manner deterred him. Not hostility, but a new indifference. Perez felt it in himself.

‘Jimmy’s just sitting in,’ Sandy said easily. ‘I take it you don’t mind.’ He spoke it such a way that it would have been impossible for Ben to object. ‘What was it with you and Shaw?’ Sandy went on. ‘Scrapping like bairns in the schoolyard. I thought non-violence was your thing. Eating lentils and seaweed. Saving the planet.’

‘It was the tension,’ Ben said. ‘All of us on top of each other in the lighthouse.’

‘But more than that,’ Sandy said. ‘Surely it was more than that.’ He looked up. ‘Did you know Angela was carrying your child?’

‘It was true then?’

‘Who told you?’ Sandy asked.

‘Not Angela. She didn’t say a thing!’ The words came out hard and bitter. And Perez thought that was what Catchpole minded most: being excluded from Angela’s life, completely disregarded. ‘She’d have got rid of the baby without even telling me she was pregnant.’

‘So who did tell you?’ Sandy was gentle, prompting.

‘Shaw. He said he heard the Fowlers talking. Sarah’s a nurse. Perhaps she guessed. Perhaps Angela talked to her.’ Perez thought then that Hugh Shaw was like some kind of snake, slithering through the lighthouse, listening at doors, spreading his poison. Catchpole looked up at Sandy. ‘Was I the father?’

‘We think you must have been. It certainly wasn’t Hugh Shaw. Theirs was a purely . . .’ Sandy hesitated, ‘. . . financial arrangement.’

‘He told me he’d slept with her.’

‘Aye well, he would.’

There was a moment of silence. ‘You never told us,’ Sandy said, ‘that you’d met Fowler before. He wrote that article for The Times about the Braer protest. It confused us for a while.’

‘Was that him?’ Ben looked surprised. ‘I never met the man. We did an interview over the phone. There were lots of interviews.’

‘A coincidence then?’

‘I suppose. Birdwatching’s a small world.’