Teenager Maggie Thompson moves with her mother, Erica, to her mother's hometown of
Franklin, Ohio, after Erica's husband leaves her. At her new high school, Maggie befriends teenagers Haley, Darrell, Chaz, and Andy. They convince
veterinary technician Sue Ann Ellington to help them buy
alcohol because they are not legally old enough to purchase it themselves. Sue Ann anonymously reports their activities, but they are released because of the officer's history with Andy's father, Ben. The next day Sue Ann invites the teenagers to drink in her basement. Over time, other teenagers arrive at her house to party and start to affectionately call her 'Ma', making her popular among the students. However, the group grows annoyed as Sue Ann continuously harasses them to spend time with her. One night, she drugs Maggie and takes her earrings. The next morning Maggie finds cuts and bruises on her body and her earrings missing. A scared Maggie tells Andy she no longer wants to go to Sue Ann's house and that she does not want him to go either. To earn the group's trust back, Sue Ann lies that she has
pancreatic cancer. Haley notices Sue Ann wearing a bracelet belonging to a friend. The girls suspect that Sue Ann has been stealing their jewelry and break into her house to investigate. They are surprised by Genie, Sue Ann's daughter from a failed marriage; Maggie is surprised to see her walking, as she uses a wheelchair at school. Maggie and Haley escape as Sue Ann comes home. Ben, who went to high school with Sue Ann, shows up at her job to drop off his cat and invites her out for drinks after work. At the bar, Ben confronts Sue Ann with a tracking device which is installed on all of his company vehicles (one of which Andy frequently borrows when visiting Ma) and asks why his son has been at her house. Ben warns Sue Ann to stay away from Andy. Years before, Sue Ann had a crush on Ben and was deceived into performing oral sex on a boy she thought was Ben. Ben had gotten the school to witness the assault, including his current girlfriend Mercedes and a young Erica. Sue Ann runs over Mercedes with her truck, killing her. She kills her boss, draws blood from Maggie's dog Louie, and lures Ben to her house, where she knocks him out. Ben wakes up naked and tied to the bed with a towel over his groin. Sue Ann then lifts up the towel grabbing onto Ben's exposed
genitalia with one hand while holding a knife with the other threatening to
cut it off, but then changes her mind, covering it back up with the towel. Sue Ann
transfuses Louie's blood into Ben, slashes his wrist, and leaves him to bleed out and die. Maggie tells her mother the truth about Sue Ann, and Erica briefly confronts Sue Ann. Sue Ann lures Maggie with a picture of herself with Andy in her basement at Chaz's birthday party. When she arrives, only the original group remains. She tries to get Andy to leave but realizes everyone has been drugged. While trying to get help, Maggie finds Ben's body, and is drugged by Sue Ann. Maggie awakens chained in the basement. Sue Ann
irons Chaz's stomach, sews Haley's mouth shut, and paints Darrell's face white. Andy awakens, and tells Sue Ann he loves her. After kissing, she stabs him for lying. A
police officer arrives and is shot by Sue Ann after Maggie screams for help. Sue Ann forces Maggie to gather her friends and take pictures. Sue Ann attempts to hang Maggie but Genie intervenes, starting a fire in the process. Everyone else wakes up and attempts to get out as the fire spreads. Erica, knowing where Maggie likely is, goes with her co-worker to save the teens. Sue Ann attempts to throw Genie into the fire and blames Erica for not stopping the sexual assault. Erica articulates her regrets and Maggie stabs Sue Ann, saving Genie. The group runs outside as Sue Ann walks upstairs and lies down with Ben's corpse as the house burns. ==Cast==