the man murmured.

"Yes, he's telling the truth," the box intoned.

"Next!"

"Nothing— I know nothing. I had nothing to do with it."

"True," the box said.

The ship was silent. Three people remained, a middle-aged man and his wife and their son, a boy of about twelve. They stood in the corner, staring white-faced at the Leiter, at the rod in his dark fingers.

"It must be you," the Leiter grated, moving toward them. The Martian soldiers raised their guns. "It must be you. You there, the boy. What do you know about the destruction of our city? Answer!"

The boy shook his head. "Nothing," he whispered.

The box was silent for a moment. "He is telling the truth," it said reluctantly.

"Next!"

"Nothing," the woman muttered. "Nothing."

"The truth."

"Next!"

"I had nothing to do with blowing up your city," the man said. "You're wasting your time."

"It is the truth," the box said.

For a long time the Leiter stood, toying with his rod. At last he pushed it back in his belt and signalled the soldiers toward the exit lock.

"You may proceed on your trip," he said. He walked after the soldiers. At the hatch he stopped, looking back at the passengers, his face grim. "You may go— But Mars will not allow her enemies to escape. The three saboteurs will be caught, I promise you." He rubbed his dark jaw thoughtfully. "It is strange. I was certain they were on this ship."

Again he looked coldly around at 

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