When adventurer Bowen Tyler is taken aboard an enemy submarine, he never dreams that his voyage will end in a land where time itself is prisoner. But in the uncharted seas at the bottom of the world, Tyler and the crew of the U-33 discover the mysterious forgotten continent of Caspak, where the savage denizens of a thousand lost ages roam vast primeval jungles.
Surrounded by dinosaurs and Bronze Age warriors, saber-toothed tigers and cunning beast-men, Bowen Tyler begins to unravel the incredible secret of Caspakeven as he battles to save the life of the woman he loves.

Edgar Rice Burroughs (1875-1950), born in Chicago, was educated at Michigan Military Academy and served briefly in the U.S. Cavalry. His early life was marked by several attempts at careers. While working as a pencil-sharpener salesman, he began writing, first advertising copy and then fiction. His first published piece, "Under the Moons of Mars," appeared in 1911 and was so successful that Burroughs began writing full-time. The first Tarzan story appeared in 1912, followed in 1914 by Tarzan of the Apes, the first of twenty-five such books. The area where he lived north of Los Angeles later became the suburb of Tarzana.

Raymond Todd is an actor-director in the theater, a poet, a jazz trombonist, and a documentary filmmaker who lives in New York.