Karen Anderson, a pretty young career girl in New York, takes a job at a model agency run by a weird brother and sister, Adam and Evelyn Marshall. Using the "model agency" as a front for recruiting girls, the Marshalls run a profitable business, renting girls to fit every taste and satisfying the various depraved desires of their wealthy clients.

Karen, unaware of the real business of the studio, agrees to pose for cheesecake photos but soon gets talked into more compromising work. When her boyfriend realizes the kind of people she is involved with, he insists that she quit. However, one of the Marshall's clients, a sadist with the willing girls supplied by the agency, insists on having Karen at a ritual ceremony which is to be the climax of a wild orgy. The Marshalls persuade Karen to go by convincing her that it is just an innocent party. At the height of the orgy she is given a painful lesson in obedience, and then branded. She becomes hysterical and tries to escape. In the wild confusion that follows, the other girls turn on the clients for revenge. A police raid and investigation finishes the "group" and the model agency that supplied it.