In 1998, Desmond Joseph Murray was thirty-three years old, a taxi driver, living in Greystones and working out of Dublin city centre. The photos attached to the file show a slight guy, medium height, with neat brown hair and a sweet, lopsided smile. I barely clocked him in Aislinn’s photo albums. So busy staring at her and hoping her face would trigger my memory, I missed what was right in front of me.

There’s one family shot in there. The wife was small, dark, groomed and good-looking; very good-looking, in the big-eyed, pouty, helpless way that makes me want to heave. And there’s Aislinn, with her too-tight plaits and a big grin, snuggled into the circle of her father’s arm.

‘You know who he reminds me of?’ Steve says. ‘Our boy Rory.’

I tilt the photo my way. He’s right; they don’t look alike, exactly, but they’re definitely the same type. ‘For fuck’s sake,’ I say. ‘What a bleeding cliché. How badly did that stupid bitch need to get a grip?’

‘She was trying to. Give her credit for that, at least.’

Clouds are building up, making the light at the windows shift and heave; the incident room feels precarious and at risk, a ship on a bad sea or an island house with a storm coming in. Something – that light, maybe, or Steve’s quiet voice dissipating out through all the empty space, fading to nothing before it can reach the walls – something makes the words sound, out of nowhere, massively sad. I don’t feel like giving Aislinn credit for anything, or like giving a fuck about her except in terms of basic professional pride, but just for that moment everything about her seems dense enough with sadness to drop you like a sandbag.

I say, ‘What I think of her doesn’t matter. Read.’

Just after three in the afternoon of the fifth of February, Desmond left home in his taxi to follow his usual Thursday routine: pick up his nine-year-old daughter Aislinn from school, drop her home, then head into Dublin to work until the closing-time crowds died down around one in the morning. He picked up Aislinn and dropped her off according to plan. That was the last his family saw of him.