Kimball Trent was the last hope of a ravaged Earth, for locked in his mind were secrets that would bring freedom to the Barbs. He lacked but one thing to release the power of those secrets--the key to the riddle of the blue monsters who could not die. [Transcriber's Note: This etext was produced from Planet Stories Summer 1945. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]…
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