Struggling actress Katie McGovern (Mary Steenburgen) is made to believe she has landed an audition for a role replacing an actress with a similar appearance. To record the requested audition tape she is taken to an isolated mansion where she is given the part. Soon Katie begins to realise that there is something much darker than film-making going on. She is held hostage by the disabled Dr. Joseph Lewis (Jan Rubes) and his assistant (Roddy McDowall) and becomes involved in their plot with a ferocious woman, whose recently murdered sister looked very like Katie.