Perez wished he had a reason to keep Berglund in Whalsay, but there was no way he could justify it. It was possible that the Setter project would be abandoned altogether now without Hattie to champion it. Rhona Laing was determined that Hattie’s death was suicide and that the use of Berglund’s knife had no significance. And perhaps she was right. The professor had been on the island when Mima was shot, but what reason could he have for killing an old Whalsay woman? He didn’t even have access to a shotgun as far as Perez knew. Hattie was a different matter. Perez could understand why the man would want her dead, and he was the last person to see her alive. But was it possible that the two deaths were unconnected, coincidental? He wondered if he should ask Berglund to stay, at least if he should arrange a more formal interview before the man left. But if he did that he’d be showing his hand. Berglund was a clever man. Better at the moment to let him think his secret was safe.

Perez continued to sit at the window, waiting for the moment when he saw Berglund drive down to the pier and on to the ferry. He wanted to be sure the man was off the island. He had almost an hour to wait before that happened, but Perez didn’t become restless or bored. He valued times of inactivity. He could think more clearly then. In his head he considered the characters playing out this drama in Whalsay. Were any of them capable of killing two people? There were occasions when his stillness drove Fran crazy. Sometimes she’d scream at him, laughing but irritated too. ‘How can you just sit there? What is going on inside your head?’ He was never quite sure how to answer. Stories, he thought. I just tell myself stories.

His mind left the inquiry, drifted back to Fran and again to marriage. Would she laugh if he proposed to her? It would seem an old-fashioned concept to her and quite outdated. Ridicule would almost certainly be her response.

When the ferry sailed off he got up. He went to the shop in Symbister and bought bread rolls, cheese, ham, fruit and cakes. There were other customers there and they fell silent until he left, when he was aware of a sudden buzz of conversation behind him. He turned back to the shop to buy a couple of cans of beer and was amused that the silence returned. He put his purchases in his car and drove to the Bod to see Sophie. With Berglund out of the way he supposed he’d find her alone.