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Blurb: “A mysterious stone, born of worlds long extinct, is the key to powers unimaginable to man-powers that could enable its owners to control the universe. Murdoc Jern, gem trader, finds that possession of the stone has led him to the center of a web of intrigue and murder.
With his companion Eet, an inscrutable feline mutant with phenomenal ESP powers, he is hunted through space, coming finally to a long forgotten planet inhab. ited by apelike "sniffers." There, facing the predatory sniffers, the antagonistic Patrol and the laser-guns of the Thieves' Guild, Murdoc must seek the source of the Zero Stone and bargain for his rights to pursue his destiny as a free man.
Fantasy, man's primitive past, and a space-age adventure have been fused to create one of Andre Norton's best novels.”