When adventurer Bowen Tyler was taken captive aboard an enemy submarine, he never dreamed that his voyage would end in a land whee time itself was prisoner. But in the uncharted sea at the bottom of the world Tyler and the crew of the U-33 discovered the mysterious forgotten continent of Caspak, where the savage denizens of a thousand lost ages roamed vast primeval jungles.
Surrounded by dinosaurs and Bronze Age warriors, saber-toothed tigers and cunning beast-men, Bowen Tyler began to unravel the incredible secret of Caspak - even as he battled to save the life of the woman he loved . . .
