Anyway. The point is, that sort of thing is just not done, at least not without some degree of warning, especially to someone who's signed off sick for the rest of the week—I'm feeling distinctly peeved. It's unprofessional . I'm just lucky Mo realized something was wrong and grabbed her violin in time to switch him off. She may be pale and shaking in the aftermath of—something very bad, I guess—but she's a trouper, or trooper, or something, and her reflexes are everything that mine are not.

When we get home, our house has been invaded by spooks. An entire team of Plumbers are at work, rewiring the perimeter defenses and daubing exclusion sigils on the window frames. Andy is sitting at the kitchen table, tapping his fingers, briefcase open, which makes it official: it's serious enough to drag management off-site. "Bob, Mo, good to see you!" He sounds relieved, which is worrying.

"Letter of Release." I cross my arms.

"You don't need it." Andy glances at Mo. "Whether we like it or not, Bob is now involved in CLUB ZERO. At least, I'm assuming that's what followed you home . . ."

"Oh dear," she says heavily, and pulls out a chair. "Bob, I really didn't want—"

"Too late, whatever it is." I grimace. I still feel a little sick, but it's mostly overspill from the music—not concussion, just a little totenlied—and I'm heartsick for her, too. "Andy, what's going on?"

"Angleton's missing," he says, with a curious little half smile, as if he's just cracked a really filthy joke and is wondering if you've even heard of the perversion he's alluding to.

"Angleton's what?" says Mo, just as I open my mouth to say exactly the same thing.

"He's missing. Do you have any information . . . no, I guess not." His cheek twitches.

Mo reaches across the table and takes my hand. I barely notice.

Angleton is just about the bedrock of the department. Yes, his position is shrouded in rumor and misinformation—to some, he's simply a DSS, a Detached Special Secretary doing boring and esoteric work in Arcana Analysis; to others he's involved in the occult equivalent of counterespionage: but the truth is a lot weirder. Angleton actually gets to talk to the Board, who nobody has actually seen in the flesh in forty years. He's the whetstone that sharpens the cutting edge of the blade our political masters fancy they wield when they tell us what to do: the dog's bollocks, in other words. He's not the heart of the Laundry—no one person is ever indispensable to any well-run agency—but he's probably important enough that if he is indeed missing, things are going to get unpleasantly exciting.

"What happened?" Mo asks.