The sight that greeted him was enough to make any man gasp, even one less young and impressionable than Sime. In all of his twenty-five years he had not seen a woman so lovely. Her complexion was the delicate coral pink of the Martian colonials—descendants of the original human settlers who had struggled with, and at last bent to their will, this harsh and inhospitable planet. She was little over five feet tall, although the average Martian is perhaps slightly bigger than his terrestrial cousin. Her hair was dark, like that of most Martians, drawn back from her forehead and fastened at the nape of her neck, from there to fall in an abundant, rippling cascade down her slim, straight back. Her figure was like those delicate and ancient creations of Dresden china to be seen in museums, but elastic, and full of strength. She was dressed in the two-piece garment universally worn by both sexes on Mars—a garment, so historians say, that was called "pyjamas" by our forebears.

And she was defiant. In her hand was a stiletto with long, slim blade. Sime made a darting grasp for her wrist and wrung the weapon from her. It fell to the metal floor with a tinkling clatter.

"And now tell me, young lady, what's the meaning of this?"

Suddenly she smiled.

"I came to warn you, Sime Hemingway." She spoke softly and sweetly, and with effortless dignity.

"You came to warn me?"

"You are in grave danger. Your mission here is known, and powerful enemies are preparing to destroy you."

"You talk like you knew something, kid," Sime admitted. "What is my mission here?"

"You have been sent to Mars by the I. F. P. in the guise of a mining engineer. You are to discover what you can about a suspected plot of interplanetary financiers to plunge the Earth and Mars into a war."