A group of friends, looking for a night of thrills and chills, visits a traveling horror-themed amusement park called Hell Fest. The park is an elaborate maze of rides, games, and mazes, all designed to scare the guests with its horror movie tropes made real. Among the friends is Natalie, who reunites with her best friend, Brooke, and her roommate, Taylor. While the rest of the group is excited for a night of fun, Natalie is hesitant but decides to join in the excitement. As they enter the park, they are unaware that a masked serial killer has integrated himself among the park’s scare actors, using the anonymity of his costume to trail unsuspecting visitors.

The friends begin to indulge in the spooky attractions, dismissing the park's gory spectacles as staged frights until a terrifying encounter makes Natalie suspicious of a particular figure in a mask. Initially believing it's all part of the experience, they shrug off the sinister presence. But as the night progresses, they soon realize that the danger is real when they witness a brutal murder, dismissed by other patrons as just another part of the Hell Fest experience. The masked killer targets the friends, using the festive chaos to his advantage, while the group must now fight to survive as they try to discern what horrors are merely fabricated and which are fatally genuine.