Now that the underground was running through the night at weekends, Steffi’s commute home from the restaurant was easy. Tonight had been a raucous one, a party of twenty businessmen loudly and repeatedly toasting someone who seemingly went by the nickname Billy Bollocks. One of the diners had called her ‘darling’ too many times, and for a moment Steffi had entertained a bizarre fantasy: of taking the red mullet off his plate, the whole fish, lifting it from its bed of rice, and putting it down the back of his neck. The mental image was so strong that Steffi laughed out loud, as if she’d seen it in a film rather than dreaming it up. The would-be fish victim had taken this for some sort of flirtation, as men of this kind often did when she laughed, smiled, or looked at them. But they had tipped quite heavily, drunkenly – at La Chimère they let you keep individual tips – so she was in good spirits as she walked to the tube.

If anything, in fact, the journey home almost wasn’t going to be long enough, given the entertainment Steffi had lined up. For the past couple of months her spare minutes had been mopped up ruthlessly by a phone app called ‘Sheep Wars’ – created by one of James’s successors in the game-tech business, though she had no idea her flatmate had ever worked in that field. Sheep Wars was so addictive that it was difficult to remember a time when she hadn’t played it at every opportunity. You were a wolf and your mission was to eat as many sheep as you could; if you caught enough of them, you went on to the next level. In the early rounds the game was boringly easy; the sheep were so slow and stupid that a 4-year-old could capture them. Steffi had been annoyed with Emil, the colleague who’d recommended it to her: did he think girls couldn’t play games? Or that she specifically was useless, just because of that one time she slipped on a bit of pulped avocado and smashed all the glasses?

But as the stages of the game went by, your prospective prey became faster, and more cunning. They armed themselves with weapons; they built fortresses. Last night she’d played it until 3 a.m., as usual, and to her amazement the sheep, who normally just shuffled around like real sheep, had escaped from her by jumping into a sports car and driving off laughing. This was level seventy-four and she hadn’t yet worked out how to respond to the sheep’s new cunning. Nobody online seemed to know how many levels there were; you couldn’t find anyone who claimed to have finished it. There was a theory, in fact, that the invisible creator was perpetually adding to the game; was a mad genius who had them all indefinitely enslaved.