Diane Gallagher, a successful Manhattan lawyer, enjoys a seemingly perfect life with her husband Ben and son Elliot. During a business trip, she engages in a passionate weekend affair with Alec Forrest, an intelligent and alluring man she meets at a gallery opening. When Diane attempts to end the liaison and return to her family, Alec refuses to accept rejection. What begins as persistent phone calls and chance encounters escalates into a terrifying campaign of psychological and physical terror. Alec insinuates himself into Diane's life, befriending her husband, threatening her son, and destroying everything she holds dear. As the obsession intensifies, Diane finds herself trapped in a nightmare of her own making, unable to convince anyone of the danger Alec poses. The film becomes a cat-and-mouse game where Diane must protect her family from a man whose love has transformed into murderous rage, exploring themes of infidelity, obsession, and the devastating consequences of casual cruelty.
