When a disturbed high school student dressed as Assasina named Mallory kills the family of her classmate and enemy, Diana Wenham, who she was friends with, in a deranged attempt to force him into a return relationship with her, the girl is captured and sent to prison. However, a year later, at her high school prom, Diana is about to come face to face with the killer once again. Will Diana and her friends be able to escape the psychopath?
