PUTNEY HIGH STREET, ABOUT FIFTEEN KILOMETERS SOUTHWEST of the center of the capital, is a bustling shopping and retail area, humming with shops and pubs and other civic amenities: the rail and tube stations, the local magistrate's court, fire stations. Leafy tree-lined roads curl away behind the high street, host to uncountable thousands of houses and maisonettes, every curb crammed with the parked cars of commuter-land.

Right now it's early evening. A fire-control truck—bulky and red, its load bed occupied by a boxy control room—is drawn up on the drive-through parking area of the court, its nearside wheels on the pavement, blue lights strobing. A couple of police cars wait nearby, ready to clear the way if the truck starts to roll.

Despite appearances, it isn't really a fire-control truck: it's owned by OCCULUS—Occult Control Coordination Unit Liaison, Unconventional Situations—that branch of the military that my employers call in when a situation, to use Angleton's ladder of apocalypse, escalates above Rung One. And right now, its occupants are doing what soldiers frequently do best: waiting for a call.

A short, wiry fellow with horn-rimmed glasses, wearing a tweed jacket with patched elbows over a green wool sweater, lounges in an office seat in front of a desk with a laptop and a bunch of communications gear bolted to it. He's prematurely balding—he isn't forty yet—and his skin is slightly translucent, as if aged beyond his years. There's an olive-green telephone handset jammed between his shoulder and his right ear, and he's twiddling his fingers impatiently as he waits on the line.

"Yes? Yes?" he demands busily.

"Connecting you now, sir ..." More static. The handset doesn't lead to a phone, mobile or otherwise, but to a TETRA terminal dedicated to OCCULUS's use: an early nineties digital radio technology, horribly obsolete, but one that the government has been locked into by a thirty-year contract. "Dr. Angleton is on the line."

"Ah, James! Are you there?"

"Major Barnes?"

"Yes, it's me! Any word on our boy?"

"We can find him." Angleton's voice is clear. Barnes sits up unconsciously expectant.

Farther back in the OCCULUS truck, a man wearing a bright yellow HAZMAT suit glances up from the H&K MP5 he's checking for the third time. Another HAZMAT-suited soldier, shorter and stockier, knuckles him in the back. "Hey, Scary, nobody ever tell you it's rude to eavesdrop?"

"Sorry, sir."

Major Barnes ignores them: Angleton is talking. "I have a preliminary fix and I'm on my way over right now. I should be with you in about five minutes. Once I'm on location I can guide you to the target in person."

"Are you sure that's advisable?"

"No, but I'll leave tactical command up to you; the problem is, I don't have an exact fix to within less than a hundred meters. I need to be on the spot."

Major Barnes swears silently. "All right, we'll have to work with that. What exactly do you think we're facing?"