And he won't be suspecting anything."

Borden scowled. "Get out the talkie and warn him. If Sattell surprises Jerry and gets his blaster, he might bushwhack us!"

Ellen brought out the talkie. She turned it on and said crisply: "Jerry, Sattell's disappeared. Come in please."

Jerry did not answer. Borden paced up and down, frowning and thinking of ever more disastrous possibilities.

"Bring the talkie into the ship," he said presently. "We'll hook it to an outside aerial. Jerry won't be traveling with his turned on. But he's bound to call us eventually."

He took the talkie from her, carried it inside the ship, and plugged it in there. In minutes a speaker in the control room was emitting the nondescript hissing which was the random electronic noises made by metal objects nearby. The ship itself, for one.

"I'm going to look in Sattell's cabin," said Borden grimly.

That was drastic action. On a space journey privacy is at once so difficult and so essential that nobody on a space expedition ever enters another's private cabin. To look in Sattell's cabin was a great violation of normal rules of conduct. But it had to be done now.

Borden went in the cabin and through Sattell's possessions. He came out looking sick.

"I found something," he told Ellen. "When we were coming in I looked at that white spot through a telescope. I didn't see anything worth noting, but I snapped the telecamera out of pure habit. Then I forgot it. But Sattell didn't. He made this."

He showed her a photographic print. Sattell had made it from the infra red image on the full color photograph. It was an enlargement, showing more detail than Borden had seen with the naked eye. There were shadows on this print, the shadows of structures. There were buildings rising from the white. There were towers. There was a city on the white spot from which a heat-ray had been projected at the Danaë out in space!

Quite as important, the threadlike lines they had noticed were here plainly highways leading away from it. One led north, judging directions from the shadows. It reached toward the polar ice-cap near which the small space-ship was grounded.

"If Sattell really expects us to kill him," said Borden, "he could have headed for that 

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