A woman gets amnesia after an accident, and doesn’t remember her life, including her husband. While she tries to recall, she meets a man and begins a relationship with him.
Julianne Moore is Catherine, a successful doctor who suspects her handsome husband David is cheating on her. To silence or answer her suspicions once and for all Catherine hires an irresistible and alluring young woman, Chloe (Amanda Seyfried), to put David’s fidelity to the test. Chloe’s seductive behavior begins to obsess Catherine. Events take an unpredictable turn with potentially fatal consequences for her family.