“And I’m only here for the tech,” Melody said firmly. “Can’t do the job without the right equipment.”

The Boss’s nostrils flared slightly. “You just like to play with the latest toys. And break them.”

JC realised, with something like wonder, that the Boss was only saying these things in order to avoid saying something else. She was distracting herself with familiar complaints so she could put off having to tell them about the new case. Which meant it had to be something really bad . . . He watched, impressed despite himself, as the Boss squared her shoulders and got down to business.

“All of this . . . is irrelevant. You are not here to receive the various dressing downs you so thoroughly deserve; you are here because the Institute is faced with a major emergency. Something bad has happened, down in the London Underground. Oxford Circus Tube Station is haunted. A Code One Haunting.”

JC sat up sharply. “A Code One, right here in the heart of London? That’s supposed to be impossible! The whole city’s covered with overlapping layers of pacts and protections, laid down ever since Roman times.”

“The unprecedented nature of the haunting is what makes this such an emergency,” said the Boss. “If what we suspect is true, all hell is about to break loose in the Underground.”

“What’s happened?” said JC. “Tell us everything.”

“It started slowly, sneaking in around the edges, almost unnoticed,” said the Boss, leaning back in her chair and watching the shapes her cigarette smoke made in the air. “Stories of odd-looking people on overcrowded platforms, who never seemed to get on any train. Uneasy presences, felt rather than seen, on deserted platforms late at night. Lights that flickered on and off, or changed in intensity, for no reason anyone could explain. Strange announcements, by unauthorised voices, saying awful, disturbing things. People travelling up the escalators who never arrived at the top. Horrid laughter in the tunnels, and never anybody there.

“Then things got worse in a hurry. Indistinct figures were seen throwing themselves in front of approaching trains; but after each train had been stopped and the tracks inspected, no body was ever found. Men and women claimed to have been pushed violently from behind, just as a train was coming in, but when they turned and looked, no-one was anywhere near them. More and more travellers were reported missing—seen going down into the Underground system, then never heard from again.

“And people came and went . . . who didn’t look entirely like people.

“It all came to a head at Oxford Circus Station, at eight thirty-five this morning. We’ve had to stop all the trains going in and out and shut the whole place down; no-one in or out, until further notice. I have a few witness statements, recordings, for you to take a look at. No comments, please, until you’ve seen them all.”