| Director | Rob Cohen |
|---|---|
| Budget | $4 million |
| Box office | $52.4 million |
Claire Peterson is a high school English Literature teacher living alone with her teenage son, Kevin, after separating from her husband, Garrett, due to his infidelity. 19-year-old Noah Sandborn, an orphan whose parents died a year prior, moves in next door to help his uncle, who uses a wheelchair. Noah promptly charms Claire and befriends Kevin, often teaching him handyman skills around their house, and begins attending his school, where she teaches.
While Kevin and Garrett go on a fishing trip, Claire reluctantly goes on a double date with her best friend and the school vice principal, Vicky Lansing. As Claire returns home, Noah invites her over for dinner at his home to which she accepts, during which he unashamedly flirts with and undresses her. With Claire losing control of herself, the two eventually have passionate sex. The following morning, Claire awakens and says that she regrets their one-night stand together, which Noah doesn't take well. As the school year begins, Noah hacks into Claire's computer, sending an e-mail to the principal requesting a transfer for himself into her class, and continues to hang out with Kevin, manipulating him into hating Garrett. When Kevin overexerts at gym class and goes into shock one day, Noah saves his life by injecting him with his EpiPen. Claire confronts Noah after he sends her flowers, thanking him for helping Kevin. However, after witnessing Garrett spending the evening with Claire at her home, Noah has flashbacks of him and Claire having sex, escalating his obsession with her.
After an incident where Noah violently assaults school bully Jason Zimmer for harassing Kevin, Vicky discovers that Noah was kicked out of his previous school for disorderly conduct and expels him after he aggressively insults her. At the school dance, Noah confronts Claire in the bathroom and reveals his obsession with her, before attempting to rape her, she attacks him and leaves, demanding that he stay away from her and Kevin. That night, Claire sees Noah having sex with Allie, Kevin's classmate and prom date. The next day, Noah leaves a printer running in Claire's classroom, with pictures of them sleeping together scattered around, but Claire removes all the photos before her students arrive. Later, when Garrett's car brakes fail, he and Kevin narrowly escape serious injury. Noah attempts to blackmail Claire with a video of them having sex, claiming he will surrender it if she continues sleeping with him, but she refuses.
Claire asks Vicky to lure Noah away from his house so she can break in and delete the video. While there, she finds nude pictures of herself on the walls along with instructions on tampering with the brakes of both Garrett's and his parents' cars, prompting her to speak with a detective about the fatal car crash that killed Noah's parents. Meanwhile, Noah holds Vicky hostage and lures Claire to her house. When Claire arrives, she finds Vicky dead and calls 911, but Noah appears. When she accuses him of killing his parents, he clarifies that his mother killed herself after his father cheated on her, and he retaliated by cutting his father's car's brakes, killing him and his mistress.
Noah takes Claire to a barn where he has Garrett and Kevin tied up, claiming he intends to kill them so that he can start a new life with her together, while demanding that Claire be with him or die with her family. He starts a fire, and a struggle ensues, during which Noah wounds Garrett and once more attempts to get Claire to leave with him, only for Claire to finally destroy Noah's obsession by stabbing him in the eye with the EpiPen. Enraged, Noah attempts to kill all three, but Claire, after denouncing him as "no hero", pulls a lever that drops an engine on Noah, ultimately killing him. Claire and Kevin then help a wounded Garrett out of the burning barn as the police and paramedics arrive.