Light splintered across my eyes like sun slamming through shattered glass, dazzled me weightless. I knew I had pulled the trigger. The silence was huge, spreading out and out till it covered the whole world, not a sound left except the rhythmic rush of my breathing. For a vast dizzy freedom like flying, for wild clean heights that almost burst my chest open, nothing in my life had ever compared to that moment.

Then that light started to dim and that cool silence wavered and broke open, filled up with a babble of shapes and noises. Shay’s face materialized like a Polaroid out of the white: battered, staring, covered in blood, but still there.

He made a terrible sound that could have been a laugh. “Told you,” he said. “I told you.” When his hand started scrabbling for the bottle again, I turned the gun around and smacked him across the head with the butt.

He let out a nasty retching noise and went limp. I cuffed his wrists in front of him, nice and tight, checked that he was breathing and propped him up against the edge of the sofa so he wouldn’t choke on his blood. Then I put my gun away and found my mobile. Dialing got messy: my hands smeared blood all over the keypad and my temple dripped onto the screen, I had to keep wiping the phone on my shirt. I kept one ear open for feet pounding up stairs, but all I heard was the faint demented gibbering of the telly; it had masked any stray thumps and grunts that might have filtered through the floor. After a couple of tries, I managed to ring Stephen.

He said, with a certain amount of understandable wariness, “Detective Mackey.”

“Surprise, Stephen. I’ve got our guy. Held, handcuffed and not one bit happy about it.”

Silence. I was doing fast circles of the room, one eye on Shay and the other one checking corners for nonexistent sidekicks; I couldn’t stand still. “Under the circumstances, it would be a very good thing all round if I weren’t the arresting officer. I think you’ve earned first shot at the collar, if you want it.”

That got his attention. “I want it.”