Andre Norton "The Zero Stone". Gollancz 1974.

Book #1 of The Zero Stone series.

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 inhabited 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 right to pursue his destiny as a free man.

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