(Except . . . Billy hadn’t wanted to hurt her. Not really. He never wanted to hurt anyone. At the last moment he had hesitated; and some other force had moved his hand. Hadn’t it?)

Billy stared in wonder at the candy-coloured train and was sure it was there to take him to a wonderful place, where he would find all the answers to all the questions that had ever troubled him. And in that place he would be made safe and happy and know pleasures he had only ever dreamed of before. Wriggling with excitement, little Billy Hartman walked confidently forward, and the brightly coloured car doors opened before him. He stepped on board and sat down, the doors closed silently, and the train took him away.

He passed through station after station, and many strange and wondrous sights revealed themselves to him through the car windows. Platforms made out of interlocked bones, the great curving station like a massive rib cage . . . huge plunging waterfalls of glistening solid crystal . . . rioting gardens full of huge flowers with thick pulpy petals and gasping pink mouths that sang sweet songs to him in high-pitched voices, like a choir of mice. Billy sighed and laughed and beat his hands together, almost drunk on the sheer splendour of it all.

The train slowed as it approached its final destination, and Billy cried out in joy, pressing his face right up against the window to better view the shining city spread out before him. Ethereal spires and massive golden domes, spiralling fairy towers connected by elegant walkways . . . and beautiful women everywhere, smiling at him. At him! Angels floated down shimmering paths and bowed their haloed heads to him. Billy was so happy he could hardly breathe. He had left the plain, hurtful, ordinary world behind him, at last. His Protector had rescued him and brought him there, to where he should have lived all along.

The train halted abruptly. The doors slammed open, and Billy hurried out onto the waiting platform, almost dancing in his eagerness to meet his Protector, and thank him, and start his new life. And then he stopped suddenly, and looked around him, confused. Something was wrong. Something was horribly wrong. The marvellous city was gone, the beautiful towers and the beautiful women were gone, and he was standing alone on a bare and empty platform. No name, no destinations, not even any posters on the walls. Billy looked back, and the brightly coloured train was gone, too. There weren’t even any rails. He’d been left here, alone, abandoned in an empty place. Billy started to cry.

It was cold, and getting colder. Billy hugged himself tightly as his breath steamed thickly on the still air. His teeth began to chatter, and his tears froze on his cheeks. Thick patterns of hoarfrost formed on the bare walls, horrid images like staring eyes and gaping mouths. Heavy jagged icicles hung down from the ceiling, like glistening stalactites. There was a sound; and Billy turned to look.

And when little Billy Hartman finally saw what it was that had been guiding and protecting him all this while, he screamed and screamed, until he tore out the lining of his throat, and blood sprayed from his mouth.

Back on the southbound platform, Natasha was making herself useful. A quick spell (muttered under her breath in what sounded very like debased Coptic), and all the blood disappeared from everyone’s clothes, leaving them still battered and torn but comfortably dry and clean. And smelling not entirely unlike a country meadow. The blood basically leapt out of the clothing and ended up scattered in puddles all around them, steaming quietly. Everyone made polite, thankful sounds, while Natasha preened prettily.

“Oh, that old thing. I’ve had that spell in my repertory for years. Never leave home without it.”

Erik sniggered. “Now tell them what you had to do to acquire that spell. And what you did with the blood afterwards.”

“They don’t need to know that!” snapped Natasha. “It would only upset them. Why do you always have to spoil everything?”

Erik shrugged. “Stick to what you’re best at, that’s what I always say.”

Melody ignored them all. She didn’t approve of magic. She busied herself with her equipment, checking the most recent displays and frowning intently at the long-range sensor readings. All her instrument panels were lit up, blazing fiercely as new information flooded in. Melody stabbed fiercely at one keyboard after another, scowling at each monitor screen in turn, reluctant to admit she didn’t understand half of what her machines were telling her. Energy readings everywhere were off the scale, spiking and changing and disappearing even as she looked at them. Some of what she was seeing made no sense at all, as though the very laws of reality were becoming slippery and unreliable under the influence of some monstrous Outside will.

Tunnels, platforms, corridors—the whole station was crawling with unnatural manifestations. Ghosts, demons, other-dimensional creatures; some of them so strange, so alien, they barely qualified as life-forms at all. Life and Death weren’t as separate as they used to be, down in the Underground.

“Stop frowning like that, Melody,” said JC. “You’ll give yourself wrinkles. What’s up?”

“Do you want the bad news, the really bad news, or the Oh we are truly fucked this time news?” said Melody. “If I’m interpreting these readings correctly, and I am, we’re in enemy territory now. Something from way beyond the fields we know or even guess at, has come among us, and is reworking the most basic laws of our reality. Writing over the world, to make it more like where the Intruder originally came from.”

“All right,” said Happy, “you’ve got my attention. Are you sure about this, Melody? The sheer power involved would . . .”

“Of course I’m not sure!” snapped Melody. “I’ve never seen readings like this! I doubt anyone has. But I am definitely seeing massive displays of other-dimensional energy, more than enough to transmute matter. Something from the afterworlds has forced open a door into our reality, settled in, and established a beachhead. Part of this Intruder has manifested in our world, taken shape and form, and rooted itself here; and more is coming through all the time. Or, if you prefer, downloading its information into our material plane, and just its presence is enough to mould the world around it. The Intruder is more . . . real, than us. And it’s not hiding any more. As though it wants us to know where it is, and what it’s doing. As though it wants us to come and find it.”

“As if we’d fall for an obvious trap like that,” said Happy. “We’re not going to fall for an obvious trap like that, are we? Oh shit, we are. I want to go home.”

He fumbled a bottle of pills out of an inside pocket, but his hands were trembling so much he spilled most of them on the floor. He got down on his knees and scrabbled for the scattered pills. He was shaking all over, and his mouth trembled as though he might burst into tears at any moment. Natasha looked down her nose at him, and Erik giggled, embarrassed. JC got down on one knee beside Happy but made no move to help or hinder him.

“Happy, don’t do this. I need you sharp and focused.”

“What if I don’t want to be sharp and focused?” said Happy, looking only at the pills in front of him. “What if I don’t want to see something that’s more real than we are?”

“It’s the job,” said JC. “Look at you; you’re a mess from what you’ve taken so far.”

“It’s only the come-down,” muttered Happy. “I’ll be fine. But I need a little taste. Something to put me right.”

“No you don’t,” said JC.

“You don’t know what I need! We can’t all be big and brave and heroic, like you! Some of us are ordinary mortals, doing the best we can!” He looked at the pills he’d collected in his hand. “If you were me, you’d be knocking back the meds, too. So you wouldn’t have to be like me.”