A naïve young girl desperate to fit in with her new boyfriend's tightly knit crew learns that membership may be deadly. Upon arriving at a party with her new boyfriend, Shawn, desperate-to-fit-in newcomer Debbie learns that the friends have formed a mysterious brotherhood nicknamed "The Murder Club." As Debbie accepts her invitation to join the mysterious club, a murderer who seems to take the group's name to heart begins killing off members one by one.