He expected Berglund to resist, but perhaps thought of the search, the publicity it would bring to the university, made him suddenly co-operative. ‘I’ll have it in a file on my laptop. Give me a few minutes and I’ll get it for you.’

Perez made the phone call from his room. Gwen James answered immediately. ‘Hello.’ A deep voice, rich, pleasant on the ears. Perez had a picture of a dark woman, full-breasted, singing jazz in a shadowy club. Ridiculous. She was probably skinny, fair and tone-deaf.

He introduced himself; found himself stuttering, trying to explain, to hit the right note. ‘There’s no real cause for concern at this point. But I wondered if you’d heard from Hattie.’

‘She called me this afternoon.’

He felt a brief moment of relief. ‘Did she tell you she planned to leave Whalsay?’

‘She didn’t tell me anything. I was in a meeting and my phone was switched off so she left a message. She just said she’d call back. She wanted to talk to me. Of course I tried to phone her when I was free but I couldn’t get through on her mobile. She often has no reception there. Perhaps she borrowed a phone to call me, or used a public box.’ There was a moment’s silence. ‘I can’t help worrying about her, inspector. In the past she’s had mental-health problems. She’s not good when she’s under stress. I thought the island would be perfect for her. Safe, relaxing. And she did seem to have a great time last year. But on the phone she sounded quite ill and panicky again.’

It was as if she was blaming Shetland, as if the place had betrayed her trust.

‘Is it like her to take herself away if she’s feeling upset?’

‘Perhaps. Yes, you’re probably right. She preferred to be alone even as a child. Crowds always sent her into hysterics.’ She paused, then added quickly, ‘I don’t think I can come up. Not at short notice. I have to be in the House tomorrow. I’m not sure how I‘d explain my absence. The last thing Hattie needs if she’s unwell is a pack of reporters on her trail.’

She seemed completely in control. Perez remembered what Fran was like when she’d believed Cassie to be missing: so desperate that she could hardly speak. He wondered if this woman suspected where Hattie might be, if that was why she seemed so calm.

‘Hattie wouldn’t have gone to her father?’

‘I don’t think so, inspector. We divorced while Hattie was still a toddler and he’s never taken much interest in her welfare. He’s a journalist. The last time I heard he was in Sudan.’

‘Is there anyone else she might have contacted if she was feeling ill? A nurse or a doctor?’