The Land that Time Forgot

Torpedoed by a German U-boat in the South Pacific during World War I, a group of adventurers find themselves marooned on Caprona, a hidden and impregnable island seemingly suspended in time, inhabited by dinosaurs, Neanderthals, scattered bands of humans, and cities of fierce humanoids. As they explore this otherworldly place, the protagonists struggle to unlock the fabulous secret at its heart.