‘I always thought something had happened to them. They were so happy when they moved in. I remember Letitia coming up here and telling me how excited they were to have found the flat. I knew about Letitia’s friend dying, and I thought that was what made them want to move away. I feel so stupid. Maybe if I’d known, I could have helped.’

At that moment, Lennon walked into the room, sparking a memory in Jamie’s head. ‘You know when Lennon went missing and you were really worried about him? I saw him with Lucy. In fact, I’m sure she was keeping him in their flat.’

Mary’s mouth dropped open.

‘I expect she knew how worried you’d be and got a kick out of it.’

On cue, the cat jumped onto Mary’s lap and she wrapped her arms around him.

‘Perhaps you could help me now,’ Jamie said.

‘Of course. Anything.’

He put down his drink. He had only drunk half of it. ‘I need to get into the Newtons’ flat. I’ve been to the police about Lucy and Chris and they think I’m inventing it all. The same happened to Letitia and David. If I can get into the basement flat I might be able to find some evidence. A key to my flat, for example, to prove that Chris could have got into my flat to plant that virus. Or a diary. That would be good. There has to be something in there that will incriminate them, especially if I put it together with Letitia’s letter and remind the police that Chris has been involved in two accidents: three if you include Kirsty’s miscarriage.’

‘Isn’t that enough? Surely if you remind the police about Letitia’s friend…’

‘No, because there’s no evidence. It would never stand up in court. It wouldn’t even get to court. I need something more. I’m certain that if I get into their flat I’ll find it.’

Mary nodded. ‘So what can I do?’

‘I need them out of the way for an hour or so. Maybe you could ask them to dinner or something.’

‘But, Jamie, they don’t like me.’

‘I know. Lucy says you’re a witch.’

Mary raised an eyebrow. ‘Does she indeed. I wish I was. I’d turn her into a mouse and let Lennon play with her.’

Jamie laughed.

Mary said, ‘I’ve got an idea. Stay here. I’ll be back in a minute.’