Total blank; then realisation dawned across Holly’s face. ‘Oh my God, that! I’d totally forgotten that. Yeah. We had a special assembly that morning, so McKenna could give us this big speech about a tragedy and assisting the police and whatever.’ Talky-mouth hand sign. ‘At the end we were all coming out of the hall into the foyer, and that phone was on the floor. I thought it was Alison’s, but I couldn’t see her; everything was a mess, everyone was talking and crying and hugging, the teachers were all trying to get us to shut up and go back to our classrooms . . . I just shoved the phone into the lost-and-found bin. I figured Alison could get it herself; not my problem. If it wasn’t hers, then whose was it?’

Flawless, even better than the real thing. And – clever clever girl – her story kept the whole school in the frame for having owned the phone. Conway’s jaded look said she’d spotted the same thing.

I took the phone back. Put it to one side, for later. Didn’t answer Holly’s question, but she didn’t push.

I said, ‘Julia and Selena must’ve told you: we know you guys used to get out at night, last year.’

Holly shot a fast glance at Mackey. ‘Don’t worry about me, chickadee,’ he said, pleasant grin. ‘My statute of limitation’s run out on that one. You’re OK.’

Holly said, to me, ‘So?’

‘What’d yous do out there?’

Her chin was out. ‘Why do you want to know?’

‘Come on, Holly. You know I have to ask.’

‘We just hung out. Talked. OK? We weren’t doing bath salts or having gang bangs or whatever you think the young people do these days. A couple of times we had a can, or a cigarette. Oh my God, shock horror.’

‘Don’t smoke,’ Mackey said severely, pointing. ‘What’ve I told you about smoking?’ Conway gave him a warning stare and he lifted his hands, all apologetic, all responsible dad who would never mess with the interview.

I ignored the pair of them. ‘Ever meet up with anyone? Guys from Colm’s, maybe?’

‘Jesus, no! We see enough of those morons already.’

‘So,’ I said, puzzled, ‘you were basically doing stuff you could’ve done indoors, or during the day. Why go to all that hassle, risk getting expelled?’

Holly said, ‘You wouldn’t understand.’

‘Try me.’

After a moment she sighed noisily. ‘Because out there in the dark was a better place to talk, is why. And because probably you never ever broke any rules in school, but not everyone always feels like doing everything exactly like they’re supposed to. OK?’

‘OK,’ I said. ‘That makes sense. I get that.’

Thumbs-up. ‘Wahey. Good for you.’