A psychiatrist named Tony sees two identical twin sisters, Norma and Mary. Norma and Mary are apparently very different from each other, to the point of conflict.

An escaped convicted murderer invades the cottage of a man, his wife and the wife's sister, whereupon he proceeds to torment this already dysfunctional trio with rape and violence.

The motel has a special room designed for sexual activities. It also has a habit of photographing sex act engines and extorting the parties concerned. One day a mysterious killer with black gloves up and the situation is changing.