It was the small ferry carrying them across the Sound to Yell, so there was no passenger lounge and they stood on the deck next to the cars. Grusche and Caroline chatted to the crew, calling them by name. Polly looked back at Unst. There was still a breeze and the water was chopped into small white-peaked waves. Back in the vehicle, waiting for the jaw of the ferry to open and let them out, Grusche and Caroline were still talking as if they were old friends – allies at least – and she was the stranger. Polly was sitting in the back of the car and Grusche turned to speak to her. ‘The ferry boys said that Sumburgh’s closed because of fog. It’s hard to imagine, isn’t it? That the weather down there could be so different.’

‘Will the fog come here again?’ Polly hated the mist and the way it shut everything down. The way it made her imagination run away with her.

‘Who knows? It depends on the direction of the wind.’ Grusche turned again and continued her conversation with Caroline about plans for the move. Polly wondered if she’d ever have that sort of friendship with Marcus’s mother.

The gallery was new and built in the shelter of a small bay. The walls were of rough stone and rounded, so Polly thought of the sheep crus and planticrubs she’d seen on the hills at Unst. Of the place where Eleanor’s mobile had been found. The owner was English, it seemed, and had made his money from a graphic-design company. This was his hobby and his indulgence. He’d brought a local potter in to run it for him, and she had her studio in the same building. Through a glass wall they could watch her at work. The owner was nowhere to be seen.

‘No expense spared, apparently,’ Grusche said. ‘That’s the way it is with some incomers. David and poor Charles must have spent a fortune at Springfield. That was such a big job, and they wanted it just so.’

They’d decided it was lunchtime and had found places in the cafe. Two elderly women were eating at the table next to theirs and Grusche greeted them and started talking about a mutual friend. The view from the big, curved window was of a pebble beach and hills beyond the bay. Inside there were examples of the gallery’s art on the wall. Polly’s attention was suddenly drawn to the painting of a young girl dressed in white. While the others looked at the menu, she stared at the painting, wondering if her imagination was playing tricks. The outline was misty, indistinct, and the background was all shadow. It was impossible to make out the features, but the dress and the ribbons in the hair looked horribly familiar.

‘Who’s that?’