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Madman Stephen Danel (Peter Lorre) presides over a prison on a remote island in the Pacific, where he works the convicts to death and profits from their labor. Aware that Danel has a hand in a slave trading ring and that all is not well on the island, government agent Mark Sheldon (Robert Wilcox) poses as a crook and has himself shipped out to the tropical penal colony. There, he teams up with Danel's abused wife, Lorraine (Rochelle Hudson), in an effort to bring down the psychotic slave driver. Wikipedia