He led her down a slope and pointed out a low white house at the end of the track and right by the sea.

‘That’s Sletts, the holiday let where they’re staying,’ Perez said. ‘They were two couples, in Unst for a friend’s wedding. Professional thirty-somethings from London.’ He paused. ‘I haven’t given them any details yet, though they know that she’s dead. Mary Lomax, the community officer, is sitting with them. Perhaps I should have gone in earlier. They’ll be tense with waiting for information. Hostile. But I’m not sure where to start with them and so I waited for you. It’s almost as if they speak a different language. As if they’re aliens from a different world.’

‘And you think I’ll have more in common with them than you? You’re joking, aren’t you?’ She looked down at her jeans, bought from a charity shop and the hem let down so that they fitted, at the hand-knitted sweater with the hole in the elbow.

‘You won’t be intimidated.’ His voice was serious. ‘I can’t imagine you being intimidated by anyone.’

The compliment took her breath away for a moment, then she almost ran down the slope to the house below, her face turned away from him so he couldn’t see that she was blushing.

Inside three people sat round a dinner table, though it seemed that the meal had been more like a picnic. There was half a French loaf, some cheese still in its wrapper, a tub of hummus. They weren’t speaking. Willow understood what Perez meant about them being members of an alien species. It was the cut and shine of the hair and the quality of the casual clothes. There’d be no Oxfam-shop jeans here. She knocked on the door and walked straight in through the immaculate kitchen. This holiday house was far better equipped than her flat in Inverness. They turned round to stare at her. Still speechless. Then they saw Perez behind her and the questions came tumbling out, one after another, the voices a chorus of well-bred noise. A motherly woman sat in the corner knitting hand-spun yarn.

Willow held up her hands and the noise faded away. The Englishwoman, Polly Gilmour, stood up. She was blonde and pale. And fraught. ‘We’ve been here for hours with no news. No communication. Mary knows as little as we do. Somebody turned up an hour ago and took our mobiles and our laptops, and he said that you’d explain. We’ve been sitting here waiting for someone to come.’ She paused. ‘Oh God, someone needs to tell Cilla.’

‘Cilla?’

‘Eleanor’s mother.’

‘If you give us the number,’ Willow said, ‘we can do that.’

A solid bruiser of a man stood up. ‘What happened? Did she kill herself? There wouldn’t have been this fuss if she’d had an accident.’

‘And you are?’ Willow turned to him.

‘Her husband. Ian.’

‘I’m so sorry, Mr Longstaff. You shouldn’t have been asked to wait for so long without any information, but it’s hard in the islands when we have so few officers. I’m so sorry about the death of your wife.’ Willow looked for a reaction. None came. His face was blank. He was the sort of man who wouldn’t show emotion, and he’d had time to take in the information of his wife’s death. Willow wished she’d been here when he’d first been told.