In a suburban high school, a dark legend looms over the students as each year a senior dies under mysterious circumstances. Chrissie, a smart and skeptical student, dismisses the curse as mere superstition, focusing instead on her plans for college and her immediate circle of friends. As graduation approaches, tension heightens with peers feeling uneasy about their imminent fates. Her best friend Tracy is particularly paranoid, contributing to the pervasive anxiety that colors their final days of school. Meanwhile, Chrissie's family life adds further stress, revealing cracks and insecurities that make her question what she knows about those closest to her.

Amid mounting fears, a violent incident involving Tracy's obsessive boyfriend Chuck draws Chrissie deeper into the supposed curse's sinister implications. Increasingly, she finds herself entangled in dangerous situations that blur the line between coincidence and something more malevolent. Additionally, local authorities seem indifferent or inept, forcing Chrissie to take matters into her own hands. As she uncovers unsettling truths about her town's history, the narrative escalates into a tense sequence of events that challenge her skepticism and test her bonds. The sense of foreboding builds as Chrissie races against time to protect herself and those she loves while delving into the darkest corners of Downers Grove.