Mackey didn’t wait for me. I watched him take the stairs a flight ahead of me, all the way down those long curves, watched him cross the hall. That dimness, that angle, he looked sinister, someone I didn’t know and shouldn’t be following, not that fast.

When I got to the door, he was leaning back against the wall with his hands in his pockets. He hadn’t bothered to light a smoke.

He said, ‘I’m bored of playing games. You and Conway didn’t get me out here because of professional courtesy. You got me out here because you need an appropriate adult. Because Holly’s a suspect in the murder of Christopher Harper.’

I said, ‘If you’d rather go back to HQ, get all this on video, we can do that.’

‘If I wanted to be somewhere else, we would be. What I want is for you to quit bullshitting me.’

I said, ‘We think it’s possible that Holly was involved in some capacity.’

Mackey squinted past me, at the treeline ringing that sweep of grass. He said, ‘I’m a little surprised I need to point this out to you, sunshine, but what the hell, let’s play. You’re describing someone who’s too thick to get her shoes on the right feet. Holly may be a lot of things, but she’s not stupid.’

‘I know she’s not.’

‘Yeah? Then let’s just make sure I’ve got the theory straight. According to you, Holly’s committed murder and got clean away with it. The Murder lads have done their little dance, got nowhere and buggered off. And now – a year later, when everyone’s given up and moved on – Holly brings you that card. She deliberately drags the Murder boys back in. Deliberately puts herself in the spotlight. Deliberately points them towards a witness who can lock her up.’ Mackey hadn’t moved from the wall, but he was looking at me now, all right. Those blue eyes, hot enough to brand you. ‘Talk to me, Detective. Tell me how that works, unless she’s the level of moron that would make the baby Jesus swear. Am I missing something here? Are you just fucking with my head to prove you’re a big boy now and I’m not the boss of you any more? Or are you honest to God standing there with a straight face and trying to tell me that makes one fucking iota of sense?’

I said, ‘I don’t think for a second that Holly’s thick. I think she’s using us to do her dirty work.’

‘I’m all ears.’

‘She found that card and she needs to know who made it. She’s narrowed it down, the same way we did, but that’s where she’s stuck. So she pulls us in to stir things up a bit, see who pops to the surface.’