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Sara is a medical student who has been experiencing a few problems, lately. She has been having blackouts and occasionally even some fits, but so far she has been able to keep up with her demanding curriculum. She has confided some of her troubles to her classmate, Nowak. However, one evening when, for no apparent reason she easily kills some customers in a sleazy bar, she can finally see that something is seriously wrong with her. Her friend tries to get her exorcised, because she certainly fits the description of the behavior of the possessed. When the exorcism fails, Sara must take drastic action to see to it that she doesn't kill again.