swirling down the damp, dark corridor, and thought of the rat that had melted in his hand. Suddenly, his mind was afire, searching through his experience with the strange not-men he had learned to detect, trying to remember everything he had learned and deduced about them before they began their brutal persecution.

They were men, and they looked like men, but they were different. They had other properties of mind, other capabilities that men did not have.

They were not-men. They could exist, and co-exist, two people in one frame, one person known, realized by all who saw, the other one concealed except from those who learned how to look. They could use their minds; they could rationalize correctly; they could use their curious four-dimensional knowledge to bring them to answers no three-dimensional man could reach.

But they couldn't project into men's minds!

Carefully, Harry peered down the misty tunnels. They were clever, these creatures, and powerful. Since they had discovered that he knew them, they had done their work of fear and terror on his mind skillfully. But they were limited, too; they couldn't make things happen that were not true—fantasies, illusions....

Yes, this dungeon was an illusion. It had to be.

He cursed and started down the right-hand corridor, his heart sinking. There was no such place and he knew it. He was walking in a dream, a fantasy that had no substance, that could do no more than frighten him, drive him insane; yet he must already have lost his mind to be accepting such an illusion.

Why had he delayed? Why hadn't he gone to the Hoffman Center, laid the whole story before Dr. Webber and Dr. Manelli at the very first, told them what he had found? True, they might have thought him insane, but they wouldn't have put him to torture. They might even have believed him enough to investigate what he told them, and then the cat would have been out of the bag. The tale would have been incredible, but at least his mind would have been safe.

He turned down another corridor and walked suddenly into waist-deep water, so cold it numbed his legs. He stopped again to force back the tendrils of unreasoning horror that brushed his mind. Nothing could really harm him. He would merely wait until his mind finally reached a balance again. There might be no end; it might be a ghastly trap, but he would wait.

Strangely, the mist was becoming 

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