Over time, the ghosts of things that happened start to turn distant; once they've cut you a couple of million times, their edges blunt on your scar tissue, they wear thin. The ones that slice like razors forever are the ghosts of things that never got the chance to happen.

It took my breath away, that evening. If you've ever dreamed that you walked into your best-loved book or film or TV program, then maybe you've got some idea how it felt: things coming alive around you, strange and new and utterly familiar at the same time; the catch in your heartbeat as you move through the rooms that had such a vivid untouchable life in your mind, as your feet actually touch the carpet, as you breathe the air; the odd, secret glow of warmth as these people you've been watching for so long, from so far away, open their circle and sweep you into it.

What I warn you to remember is that I am a detective. Our relationship with truth is fundamental but cracked, refracting confusingly like fragmented glass. It is the core of our careers, the endgame of every move we make, and we pursue it with strategies painstakingly constructed of lies and concealment and every variation on deception.

I listen to the things people want out of love these days and they blow my mind. I go to the pub with the boys from the squad and listen while they explain, with minute precision, exactly what shape a woman should be, what bits she should shave how, what acts she should perform on which date and what she should always or never do or say or want; I eavesdrop on women in cafes while they reel off lists of which jobs a man is allowed, which cars, which labels, which flowers and restaurants and gemstones get the stamp of approval, and I want to shout, Are you people out of your tiny minds?

One of my da's tragedies was always the fact that he was bright enough to understand just how comprehensively he had shat all over his life.

Now that's a concept that's always fascinated me: the real world. Only a very specific subset of people use the term, have you noticed? To me, it seems self-evident that everyone lives in the real world - we all breathe real oxygen, eat real food, the earth under our feet feels equally solid to all of us. But clearly these people have a far more tightly circumscribed definition of reality, one that I find deeply mysterious, and an almost pathologically intense need to bring others into line with that definition.

When you're too close to people, when you spend too much time with them and love them too dearly, sometimes you can't see them