She scowls, then walks past him into her kitchen and picks up the purple notebook from the table. ‘Fine. Amy couldn’t make sense of it anyway. I don’t know why I bothered.’

Robin snatches it out of her hand. ‘Your sister Amy, you mean.’

‘You know about that.’

‘Hard to miss, you standing next to her in the bloody church.’ Then he realises. ‘You had a threesome with your sister?’ he says, his voice rising at the end with incredulity.

She sighs in frustration. ‘I…’ she starts. ‘Oh, for fuck’s sake.’ She goes to the kettle and switches it on, taking a mug out of her cupboard. Her kitchen is small, but clean and bright. ‘You want one?’

‘No, thank you,’ he says, sarcastically. ‘Explain.’

‘I hadn’t seen Amy for about ten years,’ she says. ‘I didn’t know where she lived, didn’t even know she’d got married.’

‘How come?’

‘Our childhoods were less than perfect. As kids we were close, but then our lives took different paths.’ She pours water into her mug and adds a herbal teabag, hanging the tag over the edge. ‘She went down the manic-obsessive route, perfect little Amy. I… well. I preferred to self-medicate a different way. Drugs, alcohol—’

‘Prostitution?’ Robin adds, spitefully.

‘Yes. Thank you for the reminder.’ Liv carries her mug to the small dining table and sits down. Robin makes no attempt to join her, just watches from the doorway as she takes a cigarette from the packet on the table and lights it.

‘We fell out. And then I turn up at her house six months ago.’

‘And then what?’ Robin snaps. ‘Emotional reunion?’

Liv takes a long drag from her cigarette and blows out smoke. ‘Not quite.’ She screws up her face. ‘Amy thought it was funny. Thought Jonathan would get a kick out of it, screwing both sisters.’

‘He didn’t?’

‘No, his reaction was much like yours, complete disgust. She persuaded him to have a blow job, and then she told him after. He went mad, said she was sick. Kicked me out of the house.’ She shrugs, takes another drag. ‘Don’t blame him.’

‘But you kept in touch?’

‘Yeah.’ She sighs and stubs the finished cigarette out in the ashtray. ‘She’s the only family I have.’

‘So why tell me all that about her in the pub that night?’ Robin leans back against the wall, still wary. ‘If you’re so loyal?’

‘I… I don’t know. I was curious. About Jonathan’s death. And I thought if you trusted me, if I told you what you wanted to know, then you might tell me something too.’

‘And I bloody well did,’ Robin sighs. His anger has dissipated with Liv’s explanation. He believes her. ‘So why did you steal the notebook?’

‘Amy wanted to know what you had on her. She knows you think she killed him.’

‘And did she?’