Melody wanted to be the first scientist to put a ghost under the microscope and find out how it worked.

JC and Happy wandered the length of the southbound platform, looking about them, taking their time. They didn’t know what they were looking for; only that they’d know it when they saw it. The sound of their footsteps was strangely muffled, hardly echoing at all in the quiet. And yet it all seemed normal enough. The huge posters on the walls advertised recent and forthcoming movies, along with all the usual ads for expensive products and services, and even the descending list of destinations on the far wall seemed reassuringly sane and definite. The two men stopped at the end of the platform and peered dubiously into the great dark maw of the tunnel-mouth; but nothing looked back.

“I don’t see anyone,” said JC. “Can’t say I feel anything much, either.”

“Feel the air,” said Happy. “It’s colder than it should be, and . . . brittle. I’m getting a definite feeling of anticipation. Of something about to happen. And even though lights are still on . . . doesn’t it still feel dark, to you?”

“Go on,” said JC. “What else?”

“Eyes,” said Happy. “A constant feeling of being observed, by unseen eyes. Not human. Nature . . . unknown. But I can feel them, digging into my back. Whatever it is that’s down here, that terrified and traumatised all those people . . . it knows we’re here.”

“Good,” JC said briskly. “At least now we can be sure we’re not down here on a wild ghost chase. Melody? Do you have anything interesting to tell us yet?”

“Don’t shout! I can hear you perfectly.” Melody concentrated on what her instrument panels were telling her, not even glancing round at JC and Happy. “Short- and long-range sensors are all on-line and reporting in, but so far all they’re giving me is a headache. Information’s coming in faster than the computers can deal with it, and none of it makes any sense. I’m getting readings all across the board: temperature spikes, radiation surges, electromagnetic fluctuations I would have said were impossible under normal conditions; and a whole bunch of weird energy signatures are popping up all over the place.”

“Purpose?” said JC.

“Beats the hell out of me,” said Melody, stabbing viciously at various keyboards with both hands. “I’m getting definite indications of Time shifts. Intrusions from the Past. Some recent, some not. And underneath all that . . . I’m reading Deep Time, JC. From long before this station even existed. This is bad, JC, seriously bad. I’ve never seen so many extreme readings in one place before.”

“Go on,” JC urged. “Throw caution to the winds and give me your best guess as to what’s happening here.”

“I do not guess!” snapped Melody. “I am a scientist! I study data and draw logical conclusions. Only . . . there’s nothing sane or logical about any of this. I can’t make head nor tail of what my computers are telling me. If I didn’t know better, I’d say they were scared. All I can tell you is that whatever it is we’ve got down here, it’s spread itself through the whole station. There isn’t a single platform or tunnel here that hasn’t been touched, and changed.”

“But is it still confined to the station?” JC said carefully.

“Maybe. Probably. My long-range sensors get confused, the further out they reach. And before you ask: no, I can’t locate any heart or central core to this haunting. It’s all over the place.”

“It’s bad,” said Happy. He was wringing his hands together, unconsciously. “I need a pill, JC, I really do. A little something, to take the edge off.”

“No you don’t,” said JC.

“Come on, JC! You’re feeling this, too; I can tell. Like ice in your blood, and knives at your throat. Like something really bad could come charging out of that tunnel-mouth at any moment. And for everything you feel, it’s a thousand times worse for me. Who’s afraid of the big bad wolf, JC? I am. I am.”

“You’re no use to me with your brains shut down,” said JC. “There’ll be time for pills later. Now come on; concentrate. You’re stronger than you think. What exactly is it that you’re picking up?”

Happy slumped down onto the nearest metal seat and looked down at his hands squirming together in his lap. He stopped them moving with an effort. He was breathing hard, sucking the air in as though he couldn’t get enough of it. JC studied the telepath carefully, trying not to let his concern show. He’d never seen Happy this upset.

“Something awful happened down here,” Happy said softly, his words so quiet JC had to lean forward to hear them. “And I think it’s still happening. Something really nasty has set up home here, and it has plans, JC, big plans. Some strange intelligence, not human, not human at all. It feels . . . like the end of the world.”

JC nodded slowly. “Then it’s official. Oxford Circus Tube Station has become a bad place, the kind of place that makes ghosts and maintains hauntings. But why? Nothing’s happened here to justify such a change. No train crash, no terrorist bombing . . . No disaster of any kind, man-made or natural. So what was the triggering event?”

Happy shrugged. He was breathing a little more easily though he didn’t look one bit less miserable.

“Sometimes,” he said heavily, “bad places just happen. That’s life for you. And death.”

“Oh come on; there’s always something,” Melody insisted. “Just because we can’t detect it, or recognise it, doesn’t mean it isn’t there. We need to run some experiments, collect some new data.”

“Spoken like a true scientist,” said Happy. “Remember that time when you wanted to stick a thermometer up that ghost’s behind, so you could measure its core temperature?”

“That would have worked if you hadn’t stopped me.”

“Yeah, right,” said Happy.

“You want a slap?” said Melody. “I’m sure I’ve got one here somewhere.”

JC left them to it and walked up and down the platform for a while, listening to the flat sound of his footsteps, trying to pin down exactly what it was that so bothered him about the place. They’d been there for some time, making all kinds of noise, more than enough to draw anyone’s attention, but . . . No ghosts, no manifestations, not even a black cat with a bad attitude. Still, there was no doubt that he was looking very cool and elegant in his smart cream suit, and that was a comfort.

JC liked to remind himself, now and again, of what was really important.

He looked back at his team. Melody was busy with her equipment, doing things only she understood. Happy was sulking quietly on his metal seat. So, when in doubt, keep them busy and keep them occupied, and they won’t have time to be scared. It always worked for JC. He clapped his hands sharply to get their attention. The sound hardly echoed at all.

“Talk to me, Melody,” he said cheerfully. “Tell me things of importance and interest.”

“Getting definite readings now, of a single great intrusion from the Past,” said Melody. “Deep Past. And I do mean really Deep Past.”

JC looked at her thoughtfully. “The same kind of entity we encountered in the car park?”

“I said Deep Time, and I meant it,” said Melody. “We are talking ancient, maybe even primordial. So powerful it’s like a gravity well, without the well, a spiritual maelstrom . . . only pushing out, not in. Something so powerful it distorts and transforms its whole environment merely by being here. But I’m also getting a whole bunch of more recent readings, from what are quite definitely contemporary phenomena. People and events imprinted on Time, hauntings only days or weeks old. Ghosts, JC. Lots and lots of ghosts.”

“A new energy source, reinvigorating lesser patterns,” JC said thoughtfully. “But what kind of energy source?”

“I hate to say it,” said Melody, turning to look directly at JC for the first time, “but I think we have to consider the possibility of an other-dimensional intrusion. That something from a higher dimension has descended into our world and made itself at home here.”