The half-dead American raved of an unknown city... of women warriors ruled by a malignant wizard...of a great diamond, the Gonfal, with strange hypnotic power... of a long-lost English nobleman... of the savage queen who had betrayed her duty and helped him to escape. Tarzan puts little faith into Stanley Wood's story-until he sees the power of the Gonfal draw the American in spite of himself back into the clutches of the Amazons of Kaji. Then it is that the ape-man becomes once more the implacable hunter-for though he cares nothing for diamonds or lost civilizations, no one may be allowed to harm a man the Lord of the Jungle has taken under his protection.