The engine was the wealth of Mars. With it Kortha could save his people ... or the evil Guantra could rule the Universe. But neither could use the machine until its secret was solved--so they fought and schemed for the knowledge, and their planet lay on the brink of destruction. [Transcriber's Note: This etext was produced from Planet Stories Spring 1946. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]…
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