"Fine," said Ingalls sourly. "So we have the job of locating one man in the earth who might be capable of ruining it, but we don't know how." He snorted. "Could one man do it?"

"We're here because we think so; he's done some mighty impossible things so far. Few of them are known for security reasons. Actually, though it is not admitted, Professor Milton is the man whose calculations made the original uranium pile practical. He took theory and reduced theoretical equations to practical calculations before they tried it out at the University of Chicago. It was some of his calculations that—stolen, of course—put the rocket experts on the track of developing the V-2. So—?"

"Um. I begin to see."


Professor Moreiko of the Moscow Academy of Science shook his head heavily. "Ridiculous," he said in a good grade of English into the telephone. "Ridiculous, my comrade. No earthquake fault-lines exist there."

Ingalls, on the other end of the telephone, said: "We know that; but that is where we anticipate trouble."

"What manner of trouble. You do not expect—?"

"I have called every seismographic station on earth," explained Ingalls. "Or I should say that I am calling every station. Professor Milton—"

"Ah, the great Professor Milton! He is—?"

"Loose again," grunted Ingalls.