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Aided by a Polynesian girl and two telepathic dolphins, Time Agents probe the past on the deserted planet Hawaika and are catapulted back ten thousand years among the battles of prehistoric races.<

The remaining two survivors of the planet Warlock fight for survival in the face of an invasion by beetle-like Throgs.

The main protagonist of the novel is Dane Thorson, Cargo-master-apprentice on the Free Trader rocket ship the Solar Queen.