Earth's espionage ring was a headache, so the Martian Security Chief offered ten thousand credits for a key agent. But even for a price—

SPIES DIE HARD!

By Arnold Marmor

"This man is a spy for Earth," a voice droned, as the telecaster vibrated and a photo of Harry Horn flashed on the screen. "Ten thousand credits for this man, dead or alive. Contact Lazar of the Security Police. Harry Horn. Thirty-four, five feet, eleven inches, one hundred and seventy-two pounds."

Lynn Brickel snapped off the humming machine. She frowned. Horn had been high in the Martian Security Police, one of Lazar's top men. Now Horn turned out to be a spy for Earth. Why hadn't she been told? Was Green losing his trust in her? Hadn't she helped McLean and Sanderson escape from Mars?

Her short tunic shimmered as she began to pace the floor. She stopped short as a hum splashed through the room. She went quickly to the door and pressed a red button on the wall.

But the vibration of the elevator did not reach her ears. Puzzled, she opened the door, stepped into the marble hall. She shrugged, started to return to her apartment when the sound of footsteps on the stairs halted her. She waited.

He came into view. Harry Horn. There was no mistaking his face. It had flashed on and off the telecaster throughout the day.

"Brickel?" he said, coming up to her.

His white coveralls were spotted with grime. There was a dark bruise on his right cheek.