As many of you know, Caroline and I divorced a year ago. At the time there was some fuss about my being unfaithful. Can I just assure my friends who have supported me, and Charlie and Laura, through this tough time, that what has happened over the last couple of days is a re-occurrence of Caroline’s unfortunate mental illness. We wish her well but appeal to her to stop the damage that this is causing to lives.

That’s it. I’m going to face you with this. You’re the one who is mentally ill. You’re a serial adulterer and a psychopath. Why didn’t I just tell DS Percy that you’re behind the photos? That you’re trying to discredit me in a power struggle. Again, only my word for it. Anyway. Sod the injunction. I need to see you face to face. I can’t carry on talking to you in my head. I need to tell you that I know for sure and so does everyone else.

As I drive up towards the posh flat up in the hills, I wonder at Jack’s audacity. The odds are stacked against anyone believing him but he still has to stick the knife in and turn it. It’s as if he can’t come to terms with the fact that he’s been found out.

I grip the steering wheel and my knuckles are white. I want him to look at me, right at me, now that we are equal. Now that I know everything. I want him to smirk at me now, look down his nose. Wave me away, be completely distracted because I don’t matter. He won’t be able to, because he knows me. He knows that he doesn’t have the power over me that he used to have. It’s fading. He’s fading.

I pull up to the flats and there are several prestige cars parked outside. I make a bet with myself that his is the Aston Martin. He always fancied himself as a bit of a James Bond. I stop at the bottom of the driveway and park up behind some bushes. Even though I’m in Jane Smith’s car and I’m disguised, you can’t be too careful. There’s no way of knowing how the layout is organised, so I have no choice but to go up to the main door and read the list.

Number 23 is a ground-floor apartment. According to a helpful leaflet in the entrance hall it’s facing outwards on to a picturesque lake and a forest. How lovely. It also has a small raised balcony, which frames double sliding doors to the main living area.

I press the buzzer. I don’t leave it long enough before I start to press it more urgently. I keep my finger on it and I’m just changing hands when a woman appears from the front flat.