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But that was the gist of it. The man he had seen in that new building at Carlson Spacecraft was no ordinary human being.

That, however, didn’t bother Karnes half so much as the gray globe the man had disappeared into after he had been shot at. And Karnes knew, now, that the shots probably hadn’t missed.

The globe was one of two things. And the intruder had been one of two groups.

(A) One of the Surveyors of Ancient Earth, in which case the globe had been a–well, a time machine. Or

(B) A student, in which case the machine was a type of spacecraft.

The question was: Which?

If it were (A), then he and the world around him were real, living, working out their own destinies toward the end point represented by the man in the gray globe.

But if it were (B)–

Then this was the Shrine, and he and all the rest of Earth were nothing but glorified textbooks!

And there would come crises on the Shrine, duplicates of the crises on old Earth. Except that they wouldn’t be permitted to happen. The poor ignorant people on the Shrine had to be coddled, like the children they were. Damn!

Karnes crumpled the sheets of paper in his hands, twisting them savagely. Then he methodically tore them into bits.

* * * * *

When the first dawnlight touched the sea, Karnes was watching it out the east window. It had been twenty-four hours since he had seen the superman walk into his gray globe and vanish.

All night, he had been searching his brain for some clue that would tell him which of the two choices he should believe in. And he couldn’t bring himself to believe in either.

Once he had thought: Why do I believe, then, what the impressor said? Why not just forget it?

But that didn’t help. He did believe it. That alien instrument had impressed his mind, not only with the facts themselves, but with an absolute faith that they were facts. There was no room for doubt; the knowledge imparted to his mind was true, and he knew it.

For a time, he had been comforted by the thought that the gray globe must be a time machine because of the way it had vanished. It was very comforting until he realized that travel to the stars and beyond didn’t necessarily mean a spaceship as he knew spaceships. Teleportation–

Now, with the dawn, Karnes knew there was only one thing he could do.

Somehow, somewhere, there would be other clues–clues a man who knew what to look for might find. The Galactics couldn’t be perfect, or they wouldn’t have let him get the mind impressor in his hands. Ergo, somewhere they would slip again.

Karnes knew he would spend the rest of his life looking for that one slip. He had to know the truth, one way or another.

Or he might not stay sane.

* * * * *

Lansberg picked him up at eight in a police copter. As they floated toward New York, Karnes’ mind settled itself into one cold purpose; a purpose that lay at the base of his brain, waiting.

Lansberg was saying: “–and one of Brittain’s men got the stuff last night. He hadn’t passed it on to Brittain himself yet this morning, but he very probably will have by the time we get there.

“We’ve rigged it up so that Brittain will have to pass it to his superior by tomorrow or it will be worthless. When he does, we’ll follow it right to the top.”

“If we’ve got every loophole plugged,” said Karnes, “we ought to take them easy.”