Yet when the race started, Adam Crag found that he had a saboteur among his crew… a traitor! Such a man could give the Reds possession of Luna, and thereby dominate the world it circled.
Any one of the other three could be the hidden enemy, and if he didn't discover the agent soon--even while they were roaring on rocket jets through outer space--then Adam Crag, his expedition, and his country would be destroyed!
(Summary by Jeff Sutton)
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