Bowen Tyler is a young traveller and explorer who has been stranded on Caspak, a mysterious and unexplored continent in the southern seas, with his wife. Tom Billings, a powerful seaplane pilot, arrives to assist him, but the Caspak jungles are teeming with hazards, and Billings has gone missing, leaving his companions, Bradley and the others, behind at the hurriedly erected "Fort Out of Time's Abyss Dinosaur" to...

Bowen Tyler is a young traveller and explorer who has been stranded on Caspak, a mysterious and unexplored continent in the southern seas, with his wife. Tom Billings, a powerful seaplane pilot, arrives to assist him, but the Caspak jungles are teeming with hazards, and Billings has gone missing, leaving his companions, Bradley and the others, behind at the hurriedly erected "Fort Out of Time's Abyss Dinosaur" to await his return with Bowen Tyler. The rules of time have been reversed, and the inhabitants of a thousand lost millennia vie for dominion.