An evil stalks the land of Tarzan of the Apes. Tarzan follows them patiently waiting for the time to strike these intruders. But they were not the only evil that stalked the lands, in the small valley of the Ghenzi Mountains, the last remnants of an ugly, perverted people dwelled in what they called their faith. It was an ancient belief, now they were wicked and many of them were insane. They have captured Lady Barbara Collis and meant to use her as a human sacrifice!