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Later, in the hotel room, when I can't sleep - and that is some sort of consolation, because even though I have turned into the woman who ends marriages in a car park, at least I have the decency to toss and turn afterwards - I retrace the conversation in my head, in as much detail as I can manage, trying to work out how we'd got from there (Molly's dental appointment) to here (imminent divorce) in three minutes. Ten, anyway. Which turns into an endless, three-in-the-morning brood about how we'd got from there (meeting at a college dance in 1976) to here (imminent divorce) in twenty-four years.

To tell you the truth, the second part of this self- reflection only takes so long because twenty-four years is a long time, and there are loads of bits that come unbidden into your head, little narrative details, that don't really have much to do with the story. If my thoughts about our marriage had been turned into a film, the critics would say that it was all padding, no plot, and that it could be summarised thus: two people meet, fall in love, have kids, start arguing, get fat and grumpy (him) and bored, desperate and grumpy (her) and split up. I wouldn't argue with the synopsis. We're nothing special.

The phone-call, though ? I keep missing the link, the point where it turned from a relatively harmonious and genuinely banal chat about minor domestic arrangements into this cataclysmic, end-of-the-world-as-we-know-it moment. I can remember the beginning of it, almost word-for-word:

Me: 'Hiya.'

Him: 'Hello. How's it going?'

Me: 'Yeah, fine. Kids all right?'

Him: 'Yeah. Molly's here watching TV, Tom's round at Jamie's.'

Me: 'I just phoned to say that you've got to write a note for Molly to take in to school tomorrow. About the dentist's.'

See? See? It can't be done, you'd think, not from here. But you'd be wrong, because we did it. I'm almost sure that the first leap was made here, at this point; the way I remember it now, there was a pause, an ominous silence, at the other end of the line. And then I said something like, 'What?', and he said, 'Nothing'. And I said 'What?' again and he said 'Nothing' again, except he clearly wasn't baffled or amused by my question, just tetchy, which means, does it not, that you have to plough on. So I ploughed on.

'Come on.'

'No.'

'Come on.'

'No. What you said.'

'What did I say?'

'About just phoning to remind me about Molly's note.'

'What's wrong with that?'

'It'd be nice if you just phoned for some other reason. You know, to say hello. To see how your husband and children are.'

'Oh, David. '

'What, "Oh David"?'

'That was the first thing I asked. "How are the kids?"'

'Yeah. OK. "How are the kids?". Not, you know, "How are you?"'

You don't get conversations like this when things are going well. It is not difficult to imagine that in other, better relationships, a phone call that began in this way would not and could not lead to talk of divorce. In better relationships you could sail right through the dentist part and move onto other topics - your day's work, or plans for the evening, or even, in a spectacularly functional marriage, something that has taken place in the world outside your home, a coughing fit on the Today Programme, say - just as ordinary, just as forgettable, but topics that form the substance and perhaps even sustenance of an ordinary, forgettable, loving relationship. David and I, however ... this is not our situation, not any more. Phone calls like ours only happen when you've spent several years hurting and being hurt, until every word you utter or hear becomes coded and loaded, as complicated and as full of subtext as a bleak and brilliant play. In fact, when I was lying awake in the hotel room trying to piece it all together, I was even struck by how clever we had been to invent our code: it takes years of miserable ingenuity to get to this place.

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? Penguin Books Limited 2002