Jandar, the alien clawed from his airship by the cannibalistic Zarkoon bird-men while leading his aerial armada to an attack on the hidden city of Kuur, devises a daring escape into the land beyond the world's edge. But in this unknown terrain, with only a nubile jungle maid as a guide, he is no longer the hunter but the hunted ... prey for the giant fang-snouted groack ... game for the ferocious six-legged othodes … and stalked by a fate far worse than death which forces him to renounce all hope of rescue — the merciless vengeance of the fiendish Mind Wizards of Callisto …