I read through Greg’s emails so often that I almost knew them by heart. I thought they might give me a sense of his mood in the days and weeks leading up to his death. Was there a hint of anxiety? Anger? Apprehension? I couldn’t find anything and gradually they became familiar, like songs you’ve played so often you don’t hear them anymore. Then I noticed something blindingly obvious, something that everybody in the developed world apart from me must already have known. Every email showed the exact time he had pressed the send button. Each email, whether from his home or his office computer, was a fairly accurate guide as to where Greg had been at a particular moment.

Within half an hour I was back from the stationer’s with two bulky carrier-bags. I tipped their contents on to the carpet. There was a large roll of poster-sized card stock, rulers, different-colored pens and Magic Markers, highlighters, and sheets and sheets of little stickers—circles, squares and stars. It looked like the raw materials for a nursery-school art project.

I spread four of the cards in a row on the floor, using heavy books to hold the corners down. Then, using a ruler and a fine architect’s pen, I started to rule grids across them, each representing a week in the last month of Greg’s life. I traced seven columns, then drew horizontal lines cutting them into halves, then quarters, then eighths and so on, until I had chopped each column into a hundred and twenty rectangles, each representing ten minutes in a day starting at eight and finishing at midnight. I didn’t bother about the nights because we hadn’t spent a night apart in the last month.

Just from memory, I was able to cross out entire evenings I knew we had spent together. On the weekends there were whole days I eliminated with a bold stroke of black: the Saturday we had taken the train to Brighton, walked on the beach, eaten some awful fish and chips, bought a secondhand book of poetry and I’d fallen asleep on his shoulder on the journey back; the day we walked along the Regent’s Canal from Kentish Town all the way to the river. Those were two days when he hadn’t been having sex with Milena Livingstone.