A young girl named Cathy (Jenny Neumann) tries to keep her mother from making out with a man while driving one day, and she inadvertently causes her mother's death in the ensuing crash. Sixteen years later, Cathy is now named Helen and has become a psychotic actress and is starring in an upcoming play called "Comedy of Blood", where the actors are picked off one by one by an unseen assailant with a shard of glass.