Claire Bartel is a loving mother happily married, living a seemingly perfect life with her husband, a successful architect, and their little daughter. Everything changes after a tragic incident that leads the family to seek help in the form of a nanny. The new caretaker, Peyton, is charming and competent, quickly earning Claire's trust. However, what seems like a blessing soon turns into a nightmare.
Peyton is actually a bitter woman with a dark past who is determined to destroy Claire's life and take over her family. With increasingly unsettling behavior, the nanny starts manipulating situations and creating divides within the family while concealing her true intentions behind the facade of the perfect caregiver. As Claire begins to suspect, her struggle to protect her daughter and her home becomes more desperate and dangerous.
Tension escalates when Claire realizes she is dealing with a rival far more cunning than she imagined. The film explores themes of motherhood, betrayal, and the thin line between trust and danger in human relationships. In this thrilling adventure, Claire must fight not only for her family but for her own life, confronting a woman who is willing to do whatever it takes to control what she believes is hers.