Patients and those working in an isolated mental hospitals are murdered, one by one, by a madman lurking in the corridors

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 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.

During the Middle Ages, a clumsy knight returns home where his wife awaits him. Sensuous and beautiful, she has attracted several male admirers during his absence, but her chastity belt has maintained her faithfulness. Now is her chance to wrest the key from him and enjoy herself. The knight’s portly friend has a similar problem with his equally gorgeous wife. And to top it off, both men have designs on the other’s wife — leading them to devise painful methods to discourage the other from trespassing.

An American CIA agent must find the whereabouts of valuable microfilm that was smuggled over by two Russian scientists who had been hoping to defect.