dug deeper and deeper into his lungs. Reason departed from him; he was screaming incoherently as he stumbled up a stony ramp, crashed into a wall, spun around and smashed blindly into another. Then something caught at his shirt.

He felt the heavy planks and pounded iron scrollwork of a huge door, and threw himself upon it, wrenching at the old latch until the door swung open with a screech of rusty hinges. He fell forward on his face, and the door swung shut behind him.

He lay face down, panting and sobbing in the stillness.

Coarse hands grasped his collar, jerking him rudely to his feet, and he opened his eyes. Across the dim, vaulted room he could see the shadowy form of a man, a big man, with a broad chest and powerful shoulders, a man whose rich voice Harry almost recognized, but whose face was deep in shadow. As Harry wiped the tears from his tortured eyes, he heard the man's voice rumble out at him:

"Perhaps you've had enough now to change your mind about telling us the truth."

Harry stared, not quite comprehending. "The—the truth?"

The man's voice was harsh, cutting across the room impatiently. "The truth, I said. The problem, you fool, what you saw, what you learned; you know perfectly well what I'm referring to. But we'll swallow no more of this silly four-dimensional superman tale, so don't bother to start it."

"I—I don't understand you. It's—it's true—" Again he tried to peer across the room. "Why are you hunting me like this? What are you trying to do to me?"

"We want the truth. We want to know what you saw."

"But—but you're what I saw. You know what I found out. I mean—" He stopped, his face going white. His hand went to his mouth, and he stared still harder. "Who are you?" he whispered.

"The truth!" the man roared. "You'd better be quick, or you'll be back in the corridor."

"Webber!"

"Your last chance, Harry."

Without warning, Harry was across the room, flying across the desk, crashing into the big man's chest. With a scream of fury he fought, driving his fists into the powerful chest, wrenching at the thick, flailing arms of the startled man.

"It's you!" he screamed. "It's you that's been torturing me. It's you that's been hunting me down all this time, not the other people, you and your crowd of ghouls have been at my throat!"

He threw the big man off balance, dropped heavily on him as he fell back to the ground, glared down into the other's angry brown eyes.

And then, as though he had never been there at all, the big man vanished, and Harry sat back on the floor, his whole body shaking with frustrated sobs as his mind twisted in anguish.

He had been wrong, completely wrong, ever since he had discovered the not-men. Because he had thought they had been the ones who hunted and tortured him for so long. And now he knew how far he had been wrong. For the face of the shadowy man, the man behind the nightmare he was living, was the face of Dr. George Webber.

"You're a fool," said Dr. Manelli sharply, as he turned away from the sleeping figure on the bed to face the older man. "Of all the ridiculous things, to let him connect you with this!" The young doctor turned abruptly and sank down in a chair, glowering at Dr. Webber. "You haven't gotten to first base yet, but you've just given Scott enough evidence to free himself from integrator control altogether, if he gives it any thought. But I suppose you realize that."

"Nonsense," Dr. Webber retorted. "He had enough information to do that when we first started. I'm no more worried now than I was then. I'm sure he doesn't know enough about the psycho-integrator to be able voluntarily to control the patient-operator relationship to any degree. Oh, no, he's safe enough. But you've missed the whole point of that little interview." Dr. Webber grinned at Manelli.

"I'm afraid I have. It looked to me like useless bravado."

"The persecution, man, the persecution! He's shifted his sights! Before that interview, the not-men were torturing him, remember? Because they were afraid he would report his findings to me, of course. But now it's I that's against him." The grin widened. "You see where that leads?"

"You're talking almost as though you believed this story about a different sort of people among us."

Dr. Webber shrugged. "Perhaps I do."

"Oh, come now, George."

Dr. Webber's eyebrows went up and the grin disappeared from his face.

"Harry Scott believes it, Frank. We mustn't forget that, or miss its significance. Before Harry started this investigation of his, he wouldn't have paid any attention to such nonsense. But he believes it now."

"But Harry Scott is insane. You said it yourself."

"Ah, yes," said Dr. Webber. "Insane. Just like the others who started to get somewhere along those lines of investigation. Try to analyze the growing incidence of insanity in the population and you yourself go insane. You've got to be crazy to be a psychiatrist. It's an old joke, but it isn't very funny any more. And it's too much for coincidence.

"And then consider the nature of the insanity—a full-blown paranoia—oh, it's amazing. A cunning organization of men who are not-men, a regular fairy story, all straight from Harry Scott's agile young mind. But now it's we who are persecuting him, and he still believes his fairy tale."

"So?"

Dr. Webber's eyes flashed angrily. "It's too neat, Frank. It's clever, and it's powerful, whatever we've run up against. But I think we've got an ace in the hole. We have Harry Scott."

"And you really think he'll lead us somewhere?"

Dr. Webber laughed. "That door I spoke of that Harry peeked through, I think he'll go back to it again. I think he's started to open that door already. And this time I'm going to follow him through."

4

It seemed incredible, yet Harry Scott knew he had not been mistaken. It had been Dr. Webber's face he had seen, a face no one could forget, an unmistakable face. And that meant that it had been Dr. Webber who had been persecuting him.

But why? He had been going to report to Webber when he had run into that golden field in the rooming-house hallway. And suddenly things had changed.

Harry felt a chill reaching to his fingers and toes. Yes, something had changed, all right. The attack on him had suddenly become butcherous, cruel, sneaking into his mind somehow to use his most dreaded nightmares against him. There was no telling what new horrors might be waiting for him. But he knew that he would lose his mind unless he could find an escape.

He was on his feet, his heart pounding. He had to get out of here, wherever he was. He had to get back to town, back to the city, back to where people were. If he could find a place to hide, a place where he could rest, he could try to think his way out of this ridiculous maze, or at least try to understand it.

He wrenched at the door to the passageway, started through, and smashed face-up against a solid brick wall.

He cried out and jumped back from the wall. Blood trickled from his nose. The door was walled up, the mortar dry and hard.

Frantically, he glanced around the room. There were no other doors, only the row of tiny windows around the ceiling of the room, pale, ghostly squares of light.

He pulled the chair over to the windows, peered out through the cobwebbed openings to the corridor beyond.

It was not the same hallway as before, but an old, dirty building corridor, incredibly aged, with bricks sagging away from the walls. At the end he could see stairs, and even the faintest hint of sunlight coming from above.

Wildly, he tore at the masonry of the window, chipping away at the soggy mortar with his fingers until he could squeeze through the opening. He fell to the floor of the corridor outside.

It was much colder and the silence was no longer so intense.