But: no. He shook his head slowly. "Not this time, Bob." The gleam in his eye guttered out, replaced by dead-cold sobriety: "While you're up there to do the business, I want you to take a look at one of the other museum exhibits—one that's not on public display. I'll explain it later, when you get back. Take your warrant card. When you're through with the job on the worksheet, tell Warrant Officer Hastings that I sent you to take a look at the white elephant in Hangar 12B."

Huh? I blinked a couple of times, then sneezed. "You're setting me up for another working group, aren't you?"

"You know better than to ask that, boy," he grated, and I jumped back: Angleton is nobody you want to stand too close to when he's even mildly irritated. "I'll give you the background when you're ready for it. Meanwhile, get moving!"

"Whatever." I sketched a sarcastic salute and marched off back to my office, lost in thought. It was a setup, obviously: Angleton was softening me up for something new. Probably a new game of bureaucratic pass-the-parcel, seeing if some poor schmuck—I was already in charge of departmental IT services, for my sins—could be mugged into taking on responsibility for exorcising hovercraft or something.

Back to the here-and-now. The carriage is slowing. A minute later I realize it's pulling into a main line station—Wolverhampton, where I get to change trains. I shove my reading matter back into my messenger bag (it's a novel about a private magician for hire in Chicago—your taxpayer pounds at work) and go to stand in the doorway.

The air in the station hits me like a hot flannel, damp and clingy and smelling slightly of diesel fumes. I take a breath, step down onto the concrete, and try to minimize my movements as I go looking for the Cosford service. I find the platform it stops at: a crumbling concrete strip opposite a peeling wooden fence. The rails are rusty and overgrown, and a couple of young trees are trying to colonize the tracks; but the TV screen overhead is lit up and predicting a train will be along in ten minutes. I take a shallow breath and sit down, hunching instinctively towards the nearest shade. Fifteen minutes later, the TV screen is still predicting a train will be along in ten minutes; then my mobile rings. It's Mo.

"Bob!" She sounds so cheerful when she says my name: I don't know how she does it, but it cheers me up.

"Mo!" Pause. "Where are you?"

"I'm back in the office! I spent most of the morning in the stacks, I only just got your text . . ." The one telling her I was off on a day trip to Cosford. The Laundry's deep archives are in a former underground tunnel, way down where the sun doesn't shine, and neither do the cellular networks.