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Teenager Maggie Thompson relocates with her mother Erica to a small town in Ohio after the departure of her father. This marks a significant change in their lives as they adapt to a new environment and community.

At her new school, Maggie quickly forms a bond with a group of friends, including Haley, Darrell, Chaz, and Andy. Their camaraderie provides Maggie with a sense of belonging in her unfamiliar surroundings.

The group decides to procure alcohol for a gathering and seeks the assistance of Sue Ann, a local veterinary technician. Their plan backfires when Sue Ann reports them, but they narrowly escape punishment due to a connection between the police officer and Andy's father.

The very next day, Sue Ann invites the teens to her house for a party in her basement. Initially enjoyable, the gathering quickly begins to turn uncomfortable as Sue Ann's need for control and attention becomes apparent.

The situation escalates when Sue Ann observes a romantic moment between Andy and Maggie, igniting her jealousy. Her simmering rage becomes evident, revealing her obsession with Andy and unresolved feelings for his father.

In a fit of jealousy, Sue Ann drugs Maggie and steals her earrings. When Maggie awakens confused and bruised, she shares her fears with Andy, raising concerns about returning to Sue Ann's house.

To regain the trust of the teens, Sue Ann fabricates a story about having pancreatic cancer. While she tries to manipulate their sympathy, the teens start becoming suspicious when they notice discrepancies in her story.

The girls decide to investigate after meeting Genie, Sue Ann’s daughter. They are shocked to discover that Genie, thought to be wheelchair-bound, is actually fully mobile, raising further suspicions about Sue Ann's claims.

Tension rises when Ben, Andy's father, visits Sue Ann's workplace and confronts her about her relationship with his son. This encounter reveals Sue Ann's dark past with Ben, exacerbating her psychological issues.

As Sue Ann's madness escalates, she resorts to violent actions, including running over Ben's girlfriend and killing her boss. Her actions become increasingly erratic, highlighting her unstable mental state.

Maggie confides in her mother Erica about her growing fears regarding Sue Ann. However, her mother dismisses her concerns, leading to Maggie feeling isolated and unprotected.

After receiving a troubling photo from Sue Ann, Maggie confronts Andy, only to discover that all their friends have been drugged by Sue Ann. The realization of their grim situation intensifies their urgency to escape.

Maggie's horror peaks when she discovers Ben's lifeless body and sees Sue Ann torturing her friends in the basement. The terrifying scene reveals the depths of Sue Ann's madness and her intent to cause harm.

As chaos ensues, Officer arrives only to be shot by Sue Ann while trying to intervene. The situation spirals out of control, culminating in a fire that engulfs the house, pushing Maggie and her friends to their limits.

In a dramatic turn, Maggie stabs Sue Ann just as she is about to sacrifice Genie. The confrontation allows Genie to escape, but not before the tragic final moments leave lingering devastation and loss.