Enduring the horrors of Devil's Island, jailed political writer Steve Duval plots his escape into the cannibal-infested jungles that surround the prison. The prisoner enlists the aid of the commandant's daughter, Marlene, and the two embark on a deadly trek through the dense island labyrinth, menaced by ferocious jungle beasts and hunted by natives with a taste for flesh. With the warden hot on their trail and thirsty for vengeance, Steve and Marlene plunge headfirst into the jaws of death.