"Eliot," said the Hawk clearly, "doesn't it seem strange to you that Ku Sui's asteroid continued to be invisible after we had smashed through its dome?"

"What do you mean?"

"We've assumed that our smashing the dome and opening it to space killed Ku Sui and everyone inside, and destroyed all the mechanisms, including the coordinated brains. But the mechanism controlling the asteroid's invisibility was not destroyed. The place remained invisible."

The old scientist's face grew tense. Carse paused for a moment.

"That means," he went on, "that Ku Sui provided the invisibility machine with special protection for just such an emergency. And do you think he would give it such protection and not his coordinated brains? Wouldn't he first protect the brains, his most cherished possession?"

Eliot Leithgow knew what this meant. The Hawk had promised the brains in that machine—brains of five renowned scientists, kept cruelly, unnaturally alive by Dr. Ku—that he would destroy them. And his promises were always kept.

There was no evading the logic of this reasoning. The Master Scientist nodded. "Yes," he answered. "He certainly would."

"I couldn't damage the case they were in," Carse continued. "The whole device seemed self-contained. It means just one thing: special protection. Since the mechanism for invisibility survived the crashing of the dome, we may be sure that the brain machine did too. And more than that: we may assume that there was special protection for the most precious thing of all to Dr. Ku Sui—his own life."

Friday's mouth gaped open. The old scientist cried out:

"My God! Ku Sui—still alive?"