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Six Theta Pi sorority sisters named Jessica, Cassidy, Ellie, Claire, Chugs, and Megan live perfect, fun-filled college lives. When Megan discovers her boyfriend Garrett is cheating on her, the sisters plot to stage Megan's death during a makeout session with Garrett as payback for being unfaithful. During the prank, the girls and Garrett bring Megan's "dead" body to a steel mill. While the girls giggle and try to prolong the prank, they mention to Garrett that they need something to chop up the body with. When the girls' backs are turned, Garrett impales a lug wrench into her chest, actually killing her. The girls and Garrett, shocked at the murder of their best friend, dump Megan's body into a well, and vow to never ever speak of that night again. Eight months later, during the party after graduation, the girls receive a mysterious picture sent to their phones: a hooded figure holding the bloody wrench Garret used to kill Megan. They soon find the hooded figure is stalking them and their boyfriends. One by one the girls are killed off as the rest try to find out who is behind the brutal murders. The killer uses the same wrench on various victims, albeit with some modifications and flare with some highly inventive death scenes. He has added large blades to each end, and sometimes spins or throws it (not unlike a large shuriken).