Directed by Isabel Coixet, this haunting psychological thriller follows Fay, a teenage girl portrayed by Sophie Turner, whose seemingly ordinary life begins to unravel when she starts encountering her exact double. As Fay navigates the pressures of high school, a strained relationship with her mother, and the lingering mystery of her father's absence, her doppelganger's appearances grow increasingly unsettling and threatening. With the support of her loyal friend Freddy, played by Gregg Sulkin, Fay becomes consumed with uncovering the truth behind this eerie phenomenon, leading her down a dark path where reality and perception blur. The film's atmosphere is steeped in suspense and dread, amplified by the brooding presence of Rhys Ifans as a mysterious neighbor and Jonathan Rhys-Meyers as a troubled teacher. As Fay digs deeper, she uncovers secrets that challenge her very identity, forcing her to confront the possibility that the reflection staring back at her may not be a stranger at all. Coixet crafts a gripping tale of identity, memory, and the shadows that lurk within the self, keeping audiences on edge until the final frame.