fox jacket against the sharp winter air, worked at a strand of broken fence on the far north line of the Wilks farm. He straightened and looked off across the dull brown plains. The experts said this had all been ocean once; back in the days when Terra was a seething, untenanted ball of hot lava. Rex wondered how right they were. One thing was sure. A no more dull, drab, peaceful landscape could possibly be imagined. He turned to look northward toward the high ice cliffs of the polar circle. The thin air made distances deceptive and the cliffs looked to be hanging almost over Rex's head. But he knew they were many miles away. He frowned. This had seemed the logical place to start his investigation, yet what evil could lurk among these simple energetic Terrans? Such an act as had been perpetrated upon Professor Spencer was certainly beyond their ability to conceive, and Margo Spencer was certainly not hidden among them. Only one thing kept him in this vicinity and it was indeed a frail thread. The Martian hermit young Wilks had told him about. He wanted to look the man over but had delayed, feeling that even though the lead seemed hardly to be taken seriously, caution was still the better part of wisdom. Rex turned now to watch big Tom Wilks stride across the frozen brown moss of the pasture. Terran cattle, Rex had learned, thrived on the prickly stuff. Tom Wilks had a big, cordial face, roughened and seamed by the Martian cold. He slapped Rex on the shoulder and said, "Well, how do you like this outpost of civilization?" "It's different—I'll say that." "Hope you grow to like it. A man can get rich out here." "I don't doubt it." "You aren't like the others," Wilks said. "Thank you." "I mean most of the help we get out here are drifters looking for a stake. You could easy get yourself some land—make a go of it. We need good solid men out here. Now I've got a fine looking daughter—" Wilks paused. "Guess maybe I'm going too fast." "Jean's a fine girl, but you don't know much about me, Mr. Wilks."