StageFright

A dancer twists her ankle at a theater, and a costume designer takes her to a nearby hospital, which turns out to be a mental institution. After a doctor treats her ankle, they return to the theater, but a psychopath escapes and kills the costume designer. As the police investigate, the play's director decides to promote the play and rewrites the screenplay, casting new actors and actresses. However, the psychopath sneaks into the theater and begins a crime spree, putting everyone's lives at risk.