‘The afternoon before she died. Late afternoon, after the girls had gone back to the Bod. The weather was so bad that they’d left early. I was planning to leave on the first ferry the following day so I went to say goodbye. She made me tea, cut us each a slice from one of Evelyn’s cakes then got out the whisky. To keep out the cold, she said, though it was always warm enough in her kitchen.’

‘How did she seem?’

Berglund looked up sharply. ‘What possible relevance could her state of mind have if she was killed in an accident?’

‘We have to rule out all the other possibilities.’ Again Perez thought how unconvincing he must sound.

‘She wasn’t suicidal, if that’s what you mean. The idea’s ridiculous. I’ve never met anyone more full of life than Mima Wilson. She’d want to stay around just to cause mischief.’

‘Can you remember what you discussed?’

He frowned. ‘The girls. I told you they’d become like members of the family. She felt very protective of Hattie. “She’s too wrapped up in the work. What she needs is a fine young man to give her something else to think about. Don’t you think so Paul? Bring her a couple of boys up here to help on the dig.” I told her times had changed and young women wanted careers as well as families now. She said Sophie had a bit of spirit about her. She reminded Mima of herself at that age. Fond of a party.’

‘Anything else?’

‘She was going on about Evelyn again. By that time I’d had two whiskies and in the warmth of the kitchen I was finding it hard not to drop off. She said something like, “That woman’s gone too far this time. I’ll have to sort it out. Make sure I arrange things so Joseph doesn’t get hurt.”’

‘Do you know what she was talking about?’

‘Not really. Like I said, I wasn’t exactly giving the conversation my full attention. I assumed it was about island politics of some sort. I don’t know Evelyn well but she seems to build alliances then fall out with people. That sort of thing happens in the university too. I try not to have too much to do with that either.’

Perez still found it hard to think of Berglund as someone who worked in a university. His speech was too blunt and he was too big. University professors should be skinny and use long words.

‘This discovery Hattie made—’

‘Wonderful,’ Berglund interrupted enthusiastically. ‘It’s just what she needs at the beginning of her career. And fascinating. Nobody had any idea there was a house of such proportions on Whalsay. Hattie seems to have an instinct for domestic archaeology. I’m still not sure how she got it so right.’