The transformation of a highly civilized, blue-blooded young Bostonian, into the savage bone-and-muscle chief of a band of shaggy cavemen is a challenge worthy of the talents of the man who created Tarzan of the Apes. In this tale, Burroughs tells, in a thrill-after-thrill novel, the story of Waldo Smith-Jones and how his desperate effort to survive on a lost island of primitive men and primitive beasts. How Waldo was given the name of Thandar, how he had won the hand of the cave princess Nadara, and how he overcame the most desperate of odds make this a real Tarzan-type epic.