Amazon.com description: Product Description: If it is possible to conquer space, then perhaps it is also possible to conquer time. At least that was the theory American scientists were exploring in an effort to explain the new sources of knowledge the Russians possessed. Perhaps Russian scientists had discovered how to transport themselves back in time in order to learn long-forgotten secrets of the past.

That was why young Ross Murdock, above average in intelligence but a belligerently independent nonconformist, found himself on a "hush-hush" government project at a secret base in the Arctic. The very qualities that made him a menace in civilized society were valuable traits in a man who must successfully act the part of a merchant trader of the Beaker people during the Bronze Age.

For once they were transferred by time machine to the remote Baltic region where the Russian post was located, Ross and his partner Ashe were swept into a fantastic action-filled adventure involving Russians, superstitious prehistoric men, and the aliens of a lost galactic civilization that demanded every ounce of courage the Americans possessed.

Andre Norton's earlier books, Star Born and The Stars Are Ours!, have made this author one of the most popular writers in the science-fiction field. In this daring adventure into the mists of time, readers will find themselves transported to still more exciting "other" worlds.

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"Effectively utilizing the concept of time travel, the author . . . has written another imaginative, action-filled science fiction story for teenage boys. Young Ross Murdock ... is sent back into the Bronze Age, discovers a derelict galactic ship, and finds himself fighting . . . to gain control of the secrets of space flight."--ALA Booklist