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.

A group of hip friends gather at a Gothic castle owned by a wheelchair- bound older relative of one of the girls. One couple in the group, unbeknownst to the others, is smuggling heroin in some Chinese artifacts the protagonist has brought back from the Orient to give to her elderly relative. Meanwhile the deranged uncle of the protagonist, who supposedly killed the protagonist's mother (his own sister) and cut out her eyes, is wandering the catacombs spying on everyone. When one of the guests is murdered and her eyes subsequently disappear, suspicion naturally falls on the mad uncle. But is he being set up?