Voodoo Planet

Dane slid his blade out surreptitiously, setting its point against the palm of his hand and jabbing painfully, but the terrible creature continued to advance. There was no blurring of its lines.
Dane Thorson of the space-ship Solar Queen knew there was only one way to win out over this hideous thing-a battle to the end between his rational mind and the hypnotic witchcraft of Lumbrilo, the mental wizard of the planet Khatka.