Which is more info than I asked for. It’s the oldest technique in the book – get the witness pissed off with one of you, she’ll give the other one extra – and me and Steve do it a lot, but mostly we do it the other way round. I let Steve take the notes while I enjoy the feeling of being the good cop for the first time in a long time. ‘And Aislinn and Rory clicked,’ I say.

‘Big-time. Lar had read a bit out of the book and he was signing copies, and the rest of us were hanging around drinking the free wine, and Aislinn and Rory got talking. They basically vanished into a corner together – not snogging or anything, just talking and having a laugh. I think Rory would’ve stayed there all night, but Ash has this rule about not talking to a guy for too long—’

Lucy cuts off, blinking. It’s that filter – God forbid we should think bad things about poor sweet Ash – but I know what she’s on about: The Rules. ‘In case the guy guesses she’s into him,’ I say, nodding like this makes total sense.

‘Yeah. Exactly. I don’t know, that’s a bad thing for some reason.’ A twist of Lucy’s shoulder and her mouth, but it’s affectionate, not bitchy. ‘So after maybe an hour Ash came dashing over to me, and she was all, “OhmyGod, he’s so sweet and so funny and so interesting and so lovely, that was sooo much fun . . .” She said she’d given him her number and now she had to find someone else to talk to, so she stuck with me and the gang from work, but she spent the whole rest of the night going, “Is he looking over? What’s he doing now, is he looking at me?” Which he always was. They were both totally smitten.’

‘Lar who?’ I say. ‘And when was the book launch?’

‘Lar Flannery – Laurence. It was at the beginning of December, I don’t remember the exact date. A Sunday night, so theatre people could come.’

‘Did you meet Rory again after that?’

‘No, that was it. Aislinn’s only seen him a few times. She was taking it slow.’ Lucy’s head ducks to her cigarette, a long pull. We’ve just brushed past whatever she’s hiding. We leave a silence, but this time she drops nothing into it. Instead she asks, ‘Are you . . . ? I mean, do you think Rory was the one who . . . ?’

The question’s natural enough, but all of a sudden her voice is full up and leaping with things I can’t catch, and the flash of her eyes under her fringe is too fast and too intent. This means more to her, or means something more urgent, than it should.

Steve says, ‘What do you think? Would he be your guess?’

‘I don’t have a guess. You’re the detectives. Is he your prime suspect, or whatever you call it?’