Caspak Series

The Caspak trilogy follows a group of castaways who find themselves trapped in a remote, prehistoric land sealed off from the rest of the world. Across the three interconnected novels, Burroughs reveals a strange ecosystem where evolution plays out in real time, producing fearsome creatures and mysterious races unlike anything the outside world has ever known. Each book offers a different viewpoint—first from the marooned crew of a wartime submarine, then from a daring rescue mission, and finally from the long-missing Lieutenant Bradley—gradually uncovering the secrets of Caspak while delivering tense adventure, survival challenges, and a richly imagined lost-world setting. The series remains a landmark in early speculative fiction, blending pulp-era adventure with bold, imaginative ideas.