Standing outside the police station, Perez felt a moment of panic. Across the road was the town hall, Scottish Baronial, with its impressive entrance and its turrets, and down the hill was the play park where they set fire to the Viking galley at the Up Helly Aa fire-festival. This place was as familiar as home to him. Usually he’d walk into the station without thinking about it. Only last week he’d been inside, chatted to the officer on duty at the desk, gone through to his old office with its view of the town. But now, with Sandy and the lanky woman with the wild hair staring at him, it seemed an impossible task to push open the door. He imagined the smell of the rooms inside, the colour of the gloss paint on the walls, and was overcome with an irrational terror. Fran’s killer had sat inside that building and had justified his violence with a string of meaningless words. The memory of the encounter came back occasionally to disturb Perez and it was with him now, paralysing him and preventing him from moving, the anxiety and the rage making him feel physically ill. He could almost convince himself that he was having a heart attack.

‘Why don’t you come to my place?’ he said quickly. ‘Not the house in Ravenswick, but my old place down by the water. I was there only a few days ago to air it. There’ll be coffee and tea. Beer, if you fancy it. We can talk there without interruption. You can come down in my car and I’ll drop you back.’ He knew he was talking too much, but felt he’d be better on his own territory.

‘Why not?’ Sandy said, as if it was the most natural offer in the world.

The woman said nothing, but she followed.

The house was tall and narrow and stood with its feet in the water. Once boats had moored outside to unload their goods. The rooms were filled with a reflected, liquid light.

‘What a lovely place!’ Willow walked ahead of him and looked around. She stopped just inside the door and he nearly knocked into her. The long hair brushed across his face and he smelled the shampoo she’d used that morning. Lemon. Perez stepped back, shocked because he wanted to reach out to touch her, to run a hand over the curve of her shoulder, and he’d thought he’d never want to touch a woman again. Furious again – this time at himself.