Claire Peterson, a high school teacher recovering from a separation with her husband, lives with her teenage son, Kevin, in a quiet neighborhood. Her life takes an unexpected turn when a charming teenager, Noah Sandborn, moves in next door to take care of his ailing uncle. Noah quickly befriends Kevin and gains Claire’s trust by presenting himself as a helpful and considerate neighbor. Despite his younger age, Noah is mature and seems to understand Claire in a way that rekindles her desire for connection and intimacy. In a moment of vulnerability, Claire surrenders to a night of passion with Noah, believing it to be a fleeting, albeit ill-advised, indulgence.

However, the aftermath of their encounter reveals Noah’s true nature. Unable to accept the night as a one-time event, Noah becomes obsessed with Claire, insisting that they are meant to be together. His behavior swiftly escalates from affectionate to possessive, demonstrating a dangerous blend of manipulation and vengeance. As Noah’s actions grow increasingly threatening, Claire finds herself and her loved ones in peril. Struggling to protect her family and career, Claire must confront the consequences of her actions while navigating the terrifying realization that Noah will stop at nothing to be with her.