‘I wanted to confront the woman. To prove to her that I knew what her game was. I wanted something in my hand – something concrete.’ The German woman paused as if she was looking for the right words, as if she was desperate for Perez to understand. ‘Something real. I couldn’t carry Lowrie’s computer across the sand to Sletts now, could I, Jimmy?’

‘Why don’t you tell me what happened,’ Perez said. He leaned back in his chair and waited. Outside a curlew flew overhead, calling. He shut his eyes and for a moment Willow wondered if he was drifting off to sleep.

‘I had to speak to Eleanor Longstaff, to make her see what she was doing. All that evening, while she was dancing and laughing and flirting, the truth was eating away at me. She was going to make Lowrie unhappy again. You must see, Jimmy, that I had to do something. You’d be the same if anyone treated Cassie badly. Eleanor would ruin my son’s marriage and he’d become ill and depressed. He might disappear south with her, and then I’d never see him again. I could tell that she would never consider living in Shetland.’

Perez had his eyes open and leaned towards her. ‘Eleanor never planned to steal your son from you. You must know that now.’ But it was spoken in a whisper, almost to himself.

Grusche didn’t seem to hear him and continued talking. ‘After the party we tidied up a bit and then George went to bed. He’d been drinking all night and I knew that he wouldn’t wake up until the morning. I could hear him snoring, like a great big bear. Then Lowrie and Caroline went off too. I let myself outside and walked down to the beach. I could see all the people from Sletts sitting on the deck. They were talking and laughing. After a while the men went inside. Then a little later Polly disappeared too, and only Eleanor was left. And that seemed like a sign that I should go and talk to her. It was just getting light and she saw me coming. She waved to me. “Can’t you sleep either, Grusche? Shall we go for a walk?” Not waiting for an answer. I don’t think she ever really listened to what people said to her.’

There was a moment of absolute silence in the room before Grusche continued.

‘I didn’t know where we were going until she said: “Do you believe in ghosts? Do you think Peerie Lizzie exists?” That was like another sign. I said I’d show her where Vaila had seen Lizzie, and I led her up the footpath to the standing stone.’

Another silence. Perez drained the coffee in his mug. ‘Were you planning to kill her at that point, Grusche? Please tell us. It is important that we know.’