The cherry trees are in bloom in Washington DC, and Gregor perspires in the summer heat. He has grown used to the relative cool of London and this unaccustomed change of climate has disoriented him. Jet lag is a thing of the past — a small mercy — but there are still adjustments to make. Because the disk is flat, the daylight source — polar flares from an accretion disk inside the axial hole, the scientists call it, which signifies nothing to most people — grows and shrinks the same wherever you stand.

There's a concrete sixties-vintage office block with a conference suite furnished in burnt umber and orange, chromed chairs and Kandinsky prints on the walls: all very seventies. Gregor waits outside the suite until the buzzer sounds and the receptionist looks up from behind her IBM typewriter and says, "You can go in now, they're expecting you."

Gregor goes in. It's an occupational hazard, but by no means the worst, in his line of work.

"Have a seat." It's Seth Brundle, Gregor's divisional head — a grey-looking functionary, more adept at office back-stabbing than field-expedient assassinations. His cover, like Gregor's, is an innocuous-sounding post in the Office of Technology Assessment. In fact, both he and Gregor work for a different government agency, although the notional task is the same: identify technological threats and stamp on them before they emerge.