‘You know what I’d do if I wanted to leave the island without anyone seeing me?’ Billy set his mug on the floor beside him. ‘I’d get a lift in a car. Specially in the small ferry, most folk just stay in their cars on the way across. We don’t notice the passengers when we’re taking the money. You register there’s someone sitting there, but you never really look at them. There were a few of those today.’

‘Who might have given her a lift?’ Perez was talking almost to himself. ‘And where would she go once she got to Laxo?’

‘Depends what time she got there,’ Billy said. ‘Sometimes there’s a bus to Lerwick connects with the ferry.’

Perez thought perhaps he’d seen the bus when he was driving north out of town. Was it possible that their paths had crossed? Perhaps Hattie had been sitting in the bus, hunched in the seat, staring out of the window. If she didn’t turn up in the morning he’d have to talk to the bus driver. He wondered if someone in Whalsay had a photo of her. Either Sophie or Berglund would surely have a picture. He didn’t want to have to call Gwen James again. All this is an overreaction. Hattie might be an adult but she’s immature, overwrought. She’s upset because Sophie couldn’t face working with her any more. She’s like a kid in the playground, burying her head in her hands and hoping the bullies will go away.

He was reassured by the idea that she’d got a lift and left the island, that she was safe and well on the NorthLink ferry, going south to meet her mother. Sandy had been right. There was no need to make a fuss. He’d give Joseph a ring and tell him to hold off the search until he’d spoken to the ferry company in the morning.

Now Billy did stand to go. ‘Let’s hope the bairn is still asleep, eh?’ Perez was so obsessed with thoughts of Hattie that it took him a moment to realize he was talking about his son.

Chapter Twenty-three