Friends of attractive young people (obviously ) awaken to find themselves prisoners in a mysterious house with no way of escape. They're equipped with fresh accoutermentsdevices connected to the base of their skulls--and also a record on a tv screen alarms them of the task. In order to escape, they must hurt themselves and each other. The devices collect the chemicals that the brain produces when, when it hastens a predetermined sum, the doors will be opened. Fail to complete it with time, and everybody dies.