After their prison ship sinks in the Caribbean, a group of prisoners and a doctor wash ashore on a seemingly deserted island. They soon discover a strange couple, who invite them to stay at their house. While the prisoners try to plan an escape, the doctor does some investigating, and soon finds out just what the pair are really doing, and why the prisoners keep disappearing mysteriously.

A group of prisoners are being transported on a ship when it sinks in the Caribbean. The convicts and a doctor wash up on the shore of what seems to be a deserted island, but before long, they find that a strange couple live there. The prisoners accept the couple's invitation to live in their house, but soon they start disappearing one by one. When the doctor investigates, he learns what the couple have to do with the disappearances.