‘It was foggy. I saw the lights on in Setter and I could hear her television even through the closed door. I knocked and waited. She came to answer and I could smell she’d been drinking. Mima always liked a dram. “So Andrew’s sent his bairn to do his dirty work.” That was what she said. Then she pulled on a yellow jacket and pushed past me into the garden. “Come and see where they buried my lover,” she said. “It’ll all come to light once the bones have been tested.” Then she stamped ahead of me round the side of the house and towards the field. It was so easy. She was still talking and I couldn’t bear the sound of complaining any more. I let her walk a distance away from me. She turned to see why I wasn’t following. I lifted up my gun and I shot her.’ He put his head in his hands, almost as if he was covering his ears, and stared into the distance, towards the high window, where it was starting to get light. ‘Once the noise of the shot had faded it was beautifully quiet. No more talking. On the way home I took a couple of rabbits, so I wouldn’t have to explain to Anna why I’d come back empty-handed.’

‘What about Hattie?’ Perez asked. ‘Did she really have to die? And like that?’

‘She guessed, worked it out in the days after Mima died,’ Ronald said. ‘Not all of it, but that the family was involved. She heard Mima talking on the telephone to my father about the bones. And we had to get her off that land. She was obsessed about the dig. While she was alive she would never leave it alone and some time the Norwegian’s body would be found. Then it would all come out. They’d identify him and remember the money, the kroner sealed in the tobacco tins.’

‘And you wouldn’t be the rich Cloustons of Whalsay any more.’

Ronald looked away, and continued to speak. ‘Hattie heard Mima talk to Andrew on the phone. She heard them arguing. It never occurred to her that I had anything to do with the old lady’s murder. I’d been to the university in the south. I’d been civilized by my contact with the academics, I read books and knew about history. She bumped into me after she’d had her meeting with her boss: “Can we talk Ronald? I wanted to let you know that I’ve phoned Inspector Perez. I know your father’s an ill man, but really I think he might have shot Mima. I just wanted to warn you . . .”’

‘Give me the details, please. How did you kill her?’