This was a serious blow for the three thousand timeworkers who suddenly found that the glittering career they should have had was no longer going to happen. It was bad news for the human race, too, whose potential extinction by asteroid HR-6984 in thirty-seven years’ time had once been averted by an ingenious flexing of the eventline, an act that lowered the potential Armageddon to a manageable 1.8 percent and not the alarming 34 percent it was at present. Flipper O’Malley had chosen a bad time to declare time travel impossible. And if all that makes no sense, then welcome to the time industry.

“Wasn’t the wallpaper from the seventies just now?” I asked as the room wobbled for a moment and suddenly became a more modern pastel shade.

“It was a backflash,” said the receptionist, “the residual effect of the offices once being ChronoGuard. There’ll be another in a few moments. They usually come in pairs.”

There was another ripple, and her modern dress was replaced by one from the fifties.

“Always in pairs,” she said without looking up. She was about twenty, doing her nails a garish blue and eating a packet of M&M’s. Up until a few moments ago, she’d had bleached hair. She looked better in the more reserved style of the fifties, but, interestingly, she seemed utterly indifferent to the sudden change, so I ventured a theory.

“You would have been ChronoGuard, wouldn’t you?”

She gazed up at me with large, intelligent eyes. The grammatical inference of my question showed I understood the complexities of the service.

“I would have had a successful career in the timestream,” she replied with a sad smile, “but the way things stand at the moment, I marry a guy named Biff I don’t much like, have two unremarkable kids and then get hit by a car in 2041, aged fifty-five.”

“I’m sorry to hear that,” I said, musing on the misguided wisdom that allowed ex–potential employees to have both their original and new lives summarized in a paragraph or two. It was dubbed the “Letter of Destiny” and was apparently part of the Union of Federated Timeworkers severance package. The unions were powerful but had achingly slow bureaucracy. Despite the time engines’ being shut down over two years ago, the Letters of Destiny were only just falling through people’s mailboxes. To many they came as a complete surprise and met with mixed feelings. Yes, it was good to know you might have been a hero at ChronoGuard, and yes, it was good to know that you make it to fifty-one without losing your mind or your hair, but no, perhaps you could do without knowing that your wife/husband is going to sleep with your best friend and enjoy it more, and no, it’s not healthy to know that you’re going to have an arm torn off by a gorilla in six hours and there’s nothing you can do about it.

“You would have known my son,” I said. “Friday Next.”