“I know everything about you,” said the man. “You called to me.”

“No,” said Natasha. “I’m pretty sure I didn’t. You know my name; what’s yours?”

He smiled engagingly. “I have many names but one nature. I am the fire on the heath and the shriek in the night. I am the look that challenges and the glance that quickens the heart. I am the cat who is always grey and the cuckoo in the nest. Don’t you know me, Natasha?”

“I didn’t call you,” Natasha said sternly, ignoring her increased breathing, the fluttering in her stomach, and the pleasant ache between her thighs. “I don’t want you. You can go now.”

“You want me,” said the man, so close to her by then she could feel his breath on her mouth. “You need me. You can’t live without me.”

“Don’t put money on it,” said Natasha.

Her breath caught in her throat as the man changed subtly before her, becoming even more handsome and glamorous, every detail intense and overwhelming . . . But at the same time, he was too much of a good thing. Like every treat you know is bad for you; like the poison that tastes sweet even as it kills you. Natasha backed away, and the man went after her.

And Erik, forgotten by both of them, stepped in behind the young man and stabbed him in the neck with his taser turned to full strength. Lightning flared, and the man stopped dead in his tracks, his mouth stretched in a wild, inhuman howl. Natasha almost cried out as the man’s face changed abruptly before her, the details blurring and slipping. He lurched forward another step, his hands reaching imploringly out to Natasha; but they weren’t hands any more. He didn’t look like a man any more. The slumping figure turned abruptly and lashed out at Erik, one overlong arm scything through the air with deadly speed. But Erik was no longer there.

He’d put away the taser and taken out his pointing bone. And as the figure changed still more, sloughing off its veneer of Humanity to become something so disturbing that human eyes could not bear to look at it, Erik shielded his eyes and stabbed the pointing bone in its direction. The figure cried out again, in pain and horror and thwarted rage, and disappeared.

Erik lowered his trembling hand and moved forward to make sure the thing was really gone. He waved both his hands through the air where it had been, and only then did he go over to join Natasha, who was leaning against the wall with her eyes shut, breathing hard. Erik stopped a safe distance away and waited. He knew better than to touch her, or even say something reassuring. He looked at the poster on the wall. The countryside was simply a painted scene again, but interestingly, there was no trace anywhere of the young man. No-one stood under the oak tree any more.

Erik glanced down at his cat-head computer. “Don’t suppose you’ve any idea as to what just happened?”

“It wasn’t a ghost, and it wasn’t real,” said the cold, inhuman voice. “It was a signal, broadcast by the bad thing that’s waiting for you. The taser interrupted the signal, and the pointing bone dispersed it. The bad thing knows you’re looking for it. It was testing you. Or perhaps it was playing. Who knows why the gods do anything?”

Erik looked at it sharply. “Gods?”

“Manner of speaking,” said the cat head, and it stopped talking.

Natasha pushed herself away from the wall and stood up straight, pulling at her leather outfit here and there to make sure she looked good. She took one last deep breath, let it out slowly, then glared at Erik, herself again.

“Next time, don’t take so long.”

“You’re welcome,” said Erik. And then he went for her, his clawed hands reaching for her throat.

Happy had been biding his time. With Natasha weakened and distracted, he eased free of her mental domination without her even noticing. So it was the easiest thing in the world for him to take control of Erik and throw the nasty little man at Natasha. It helped that Erik had often thought of doing it, and for a moment even thought it was his own idea. He grabbed the front of Natasha’s pink leather jacket with both hands and slammed her back against the wall. He crowded in close, holding her there with his full weight, pushing his face right into hers, his eyes and his smile full of all the awful things he wanted to do to her. When it came to the domination game, Erik had always been happy to swing both ways. He knew by then that he was acting under Happy’s direction, but he didn’t care. He savoured the moment, delighting in the chance to do really appalling things and still be able to claim it was nothing to do with him.

And while the two of them were struggling, Happy grabbed Melody, hauled her to her feet, and half led and half carried her to the nearest exit. She was only half-conscious, but once he got her feet under her, she got the idea fast enough.

Natasha kneed Erik in the balls so hard it practically drove his testicles up into his chest cavity. He fell away from her, all but paralysed by the terrible pain between his legs, and Natasha thrust her thoughts inside his head and broke Happy’s control in a moment. Erik contracted into a full foetus on the platform, wrapped tightly around his pain, fighting to get his lungs working again. Natasha looked for Happy and Melody, but they were already gone, and she knew better than to go chasing after them. Far too many dark places and ambush points. She tried to follow them with her mind, but Happy had his shields firmly back in place, and Natasha couldn’t even detect the shields. She cursed once, briefly and dispassionately. Erik rose slowly to his feet, tears rolling down his face, still bent over the pain coursing through him. Natasha slapped him viciously across the face. Erik rocked on his feet from the blow but took it.

“Talk to your nasty little computer,” Natasha said coldly. “Find our two runaways.”

Erik was glad of an excuse to kneel again, but the cat head wasn’t of much use. Happy’s shields really were first-class.

“Interesting,” the cat head said finally. “I cannot see Happy or Melody, or JC, or the ghost he’s chasing. Something is muddying the aether. But I am picking up another human presence down here in the station with us.”

“You’re sure it’s not JC?” said Natasha.

“I know what he looks like,” said the cat head. “This isn’t him. No; a very interesting mind, this, very . . . odd. Not one of the Project’s people and not one of the Institute’s field agents. Very odd . . . I can see him, but I can’t lock on to him. He’s . . . protected.”

Erik and Natasha looked at each other. Erik made himself ask the obvious question. “Who’s doing the protecting?”

“Can’t you guess?” said the cat head. “The bad thing, of course.”

Erik rose painfully to his feet again. “My machine’s too limited for this.”

“Speak for yourself,” said the cat head.

“Shut up,” said Erik. “Melody wouldn’t have come down here without all the very latest devices the Institute could provide. They might be able to help us more. Can you tell us where they are, cat?”

“Of course. Southbound platform, not ten minutes’ walk from here. I can guide you right to it.”

“Institute agents always get the best toys,” said Erik. “I mostly have to design my own, on a budget significantly less than I was promised. And you have to order parts three months in advance . . . Luckily, I can usually make my own. Providing there’s a zoo or a hospital nearby.”

“I can feel too much information coming on,” said Natasha. “Move it.”

Melody’s precious machines were right where she’d left them, and Erik almost cooed with pleasure as he ran his fat little hands over them. It didn’t take him long to get the hang of the sensors and track down the Institute agents. Happy and Melody were still moving steadily through the deepest parts of the system, but JC, surprisingly, wasn’t that far away. Still chasing his ghost.