"I owe you an apology," he said. "I acted like an idiot this morning."

"Don't blame yourself," Walton said. "It was only natural that you'd trust Sellors; you'd known him so long. But you can't trust anyone these days, Martinez. Not even yourself."

"I will have to resign," the security man said.

"No. It wasn't your fault. Sellors was a spy and a bungler, and he paid the price. His own men struck him down when that rumor escaped that he was going to inform. Just send me a new man, as I asked—and make him a good one!"

Keeler, the new security attaché, was a crisp-looking man in his early thirties. He reported directly to Walton as soon as he reached the building.

"You're Sellors' replacement, eh? Glad to see you, Keeler." Walton studied him. He looked tough and hard and thoroughly incorruptible. "I've a couple of jobs I'd like you to start on right away. First, you know Sellors was looking for a man named Lamarre. Let me fill you in on that, and—"

"No need for that," Keeler said. "I was the man Sellors put on the Lamarre chase. There isn't a trace of him anywhere. We've got feelers out all over the planet now, and no luck."

"Hmm." Walton was mildly annoyed; he had been wishfully hoping Sellors had found Lamarre and had simply covered up the fact. But if Keeler had been the one who handled the search, there was no hope of that.

"All right," Walton said. "Keep on the hunt for Lamarre. At the moment I want you to give this building a thorough scouring. There's no telling how many spy pickups Sellors planted here. Top to bottom, and report back to me when the job is done."

Next on Walton's schedule was a call from communications. He received it and a technician told him, "There's been a call from the Venus ship. Do you want it, sir?"