“Is it there now?” said JC.

“Oh yes,” said Melody. “It’s driving my long-range sensors crazy. They don’t like the taste of it at all.”

Kim looked round suddenly. “JC, something’s coming.”

Everyone turned to look at her. JC moved over to stand beside her, but her gaze was elsewhere.

“Are you sure?” said Melody. “There’s nothing on the monitors.”

“Something’s coming,” said Kim, in a dreamy voice. “Something bad.”

JC studied Kim, who was floating in mid air with her head cocked slightly on one side, as though listening to something only she could hear.

“What is it, Kim? What’s coming for us? Where is it coming from?”

Her left hand rose slowly to point at the far tunnel-mouth. Everyone looked into the darkness, but there was no roar of an approaching train, no pressure wave of disturbed air. Even the rail tracks were free of any vibration. Natasha and Erik stood close together. JC and Happy stared silently at the tunnel-mouth, considering their options. And Melody stood protectively between her machines and whatever was coming, her machine-pistol at the ready. Happy surreptitiously dry swallowed a couple of pills. He took a deep breath, and sweat popped out across his face. His heart was beating dangerously fast.

A Tube train emerged from the tunnel-mouth, moving smoothly and silently, an ordinary train, with ordinary empty cars. Except the engine made no sound at all, and the brightly lit cars didn’t rock or clatter in the slightest. The train pulled slowly, steadily, into the station, with barely a breath of disturbed air, and came easily to a halt. The five agents braced themselves, ready for any kind of attack; but nothing happened. After a while, one set of car doors slid silently open and waited, invitingly. No-one moved. None of them liked the look of this train. There was nothing obviously unnatural about it, apart from its quiet, but if anything, it was too ordinary, too perfect, as though it was newly made, never used before.

“All right,” said JC. “This is an invitation. The Intruder sent this train to bring us to it. No more games, no more attacks . . . But why? Because we’ve proved we can handle anything it can throw at us? Because we’ve proved ourselves worthy? Or because it’s so much stronger on its home ground . . . Could it be that it’s afraid there’s something we could do, to drive it from our plane, if it doesn’t deal with us first? Is it because the Light reached down and touched me, or because we have Kim now?”

“Questions, questions,” said Natasha. “At the Project, we prefer direct action.”

“Shoot first and ask questions later,” said Erik. “Preferably through a medium.”

“We can’t answer questions without new data,” said Melody. “And we have to do something, while we still can. This thing’s power levels are already off the scale. I think it’s getting ready to spread its influence beyond this station.”

“You mean through the rest of the Underground?” said JC.

“I mean through the rest of the city,” said Melody. “And then across the worlds. Rewriting the rules of our reality to make a new world, more like its home dimension. I don’t think there’d be much room for Humanity in a world like that.”

“We have to warn people,” said Happy. “Contact the Boss, call for help . . . Get some of the A teams down here, with serious firepower. This has got way too big for us.”

“You heard the Boss,” said JC. “None of the A teams can get here in time. There is no-one else. Just us.” He looked at Natasha and Erik. “I hate to ask, but I think at this point I’d even welcome help from the Project. Is there any chance . . .”

“No,” Natasha said reluctantly. “By the time we convinced the Project, it would be too late. Our current Head, Vivienne MacAbre, isn’t as trusting as we are.”

“I’ve heard of her,” said Happy, unexpectedly. “Does she really eat white mice for breakfast?”

“So they say,” said Erik. “Baby mice, stuffed with hummingbirds’ tongues. On little toast soldiers. Of course, that’s only when she isn’t feasting on the hearts of our enemies. Vivienne’s always been a traditionalist at heart.”

JC looked at Melody. “What do your machines make of this train? Is it real or something created by the Intruder?”

“I can’t tell,” Melody said helplessly. “With the power levels the Intruder’s generating, the question’s pretty much meaningless. It can make things real just by thinking about them.”

Happy strode up to the car and kicked the open doors. “Feels real.”

“Oh hell,” said JC. “You’ve taken some of mother’s little helpers, haven’t you?”

“Oh yes!” said Happy. “And I feel great!”

“Wonderful,” said JC. He considered the train for a long moment. “It’s real enough. It’ll get us there. Because the Intruder wants to meet us in person. Well, I want to meet the Intruder. So let’s go.”

He stepped into the car through the waiting doors and looked quickly around to assure himself it really was as empty as it appeared. Kim floated in after him, comforting him with her presence as best she could. She knew he was remembering another train, and another car, and what had happened to him there. JC took off his sunglasses and looked up and down the length of the car; but even his new eyes couldn’t detect any booby-traps or hidden evils. He glanced briefly at Kim.

“I’m fine. You?”

“I’m fine, JC.”

“Can you see anything? Sense anything? Anything the Intruder wouldn’t want us to know about?”

“This isn’t a train,” said Kim. “It’s the Intruder’s idea of a train. A new-made thing, based on the hell trains it used to abduct the commuters earlier. There’s no driver in the engine; the train knows where it needs to go. The Intruder’s becoming stronger all the time . . . its thoughts and intentions can take on shape and form now.”

“All the more reason to brace it in its lair now,” said JC. “Before it becomes so strong it can bring us to it just by thinking about it.”

He gestured sharply to the others still hesitating on the platform, and one by one they entered the car. Natasha made a point of striding fearlessly through the open doors. Erik scurried in after her, trying to look in every direction at once. Happy positively bounded on board, smiling foolishly. Melody gave her machines a last farewell pat and stepped through the doors as though it were just another train. Happy slipped his arm through hers and beamed at her chummily. Melody pulled her arm free and slapped him round the head. The doors slammed together abruptly, and the train moved off, leaving the platform behind.

The train ride was unnaturally smooth and easy. The engine was utterly silent, the car didn’t rock in the least, and once it entered the tunnel-mouth, the train never once deviated from its path. No jolts or turns, no corners, no other platforms; only a straight line through an endless, impenetrable darkness. Not one trace of light outside the car windows, and with no stations or landmarks to judge the train’s progress, it was hard to tell if it was moving at all. Or even if they were still underground rather than moving through some great night-dark sea.

Natasha and Erik sat side by side, not looking at each other. She seemed entirely calm and in control; he was keeping a watchful eye on every part of the car, in case something should jump out at him. Melody stood with her back to the car doors, arms tightly folded across her chest, glaring about her as though daring anything to try anything. Happy was too full of nervous energy to stay in any one place for long. He tried half a dozen seats, couldn’t settle, and finally skipped up and down the central aisle, humming tunelessly and occasionally breaking into a surprisingly accomplished soft-shoe routine. JC sat quietly, thinking and planning, and Kim did her best to sit beside him though she had a tendency to rise and fall in place when her concentration wandered. She studied JC with real concern, but he didn’t notice. He was working.