A snooty homecoming queen (Kate), a lovable, but dim-witted jock (Halftime), and an apathetic Goth girl (Audrey) are stuck in detention for unknown reasons, and when Kate goes missing and strange images and noises begin haunting them, Audrey and Halftime soon realize that their after-school punishment is from a higher power, who wants them to atone for a homecoming court voting scandal and a parade accident that claimed all of their lives.