1) An 18-year-old seeks revenge for bullying by killing former classmates in significant locations, wearing a mask at each crime scene.
2) As the police investigate the killings, a group of friends becomes suspects, including the protagonist Chrissie.
3) In a twist at the end, Chrissie believes she has found the killer but actually kills an innocent friend, before the real killer - her boyfriend Marcus - reveals himself and kills her as well.