"The Mars," shouted Roger.

"The Venus!" roared Astro.

"All right," said the driver with a laugh, "make up your minds."

"Which of 'em is nearest the center of the city?" Tom asked.

"The Mars."

"Then blast off for Mars!" ordered Tom, and the air car shot away from the station and moved up into the stream of expressway traffic fifty feet above the ground.

As the little car sped along the broad avenue, Tom remembered how often, as a boy, he'd envied the Space Cadets who'd come to his home town of New Chicago on leave. Now here he was—in uniform, with a three-day pass, and all of Atom City to enjoy it in.

A few minutes later the air car stopped in front of the Mars Hotel. The cadets saw the entrance loom before them—a huge opening, with ornate glass and crystal in many different colors.

They walked across the high-ceilinged lobby toward the desk. All around them, the columns that supported the ceiling were made of the clearest crystal. Their feet sank into soft, lustrous deep-pile rugs made of Venusian jungle grass.

The boys advanced toward the huge circular reception desk where a pretty girl with red hair waited to greet them.