Directed by Tate Taylor and written by Erin Cressida Wilson, The Girl on the Train is based on the British 2015 debut novel of the same name. The film stars Emily Blunt, Rebecca Ferguson, Haley Bennett, Justin Theroux, Luke Evans, Allison Janney, Édgar Ramírez and Lisa Kudrow.
Synopsis: Rachel Watson (Emily Blunt) is an alcoholic who divorced her husband, Tom Watson (Justin Theroux), after catching him cheating on her with their real estate agent, Anna Boyd (Rebecca Ferguson). During their marriage, Rachel was prone to alcohol-induced blackouts, during which she engaged in self-destructive behavior.
Rachel shares an apartment with her friend Cathy (Laura Prepon) and spends her days commuting on a train, and stalking Tom, Anna and their newborn daughter Evie. During her trips, Rachel grows fascinated with Tom’s neighbors, Scott (Luke Evans) and Megan Hipwell (Haley Bennett), a young couple in what Rachel believes is a perfect marriage. In reality, Scott is aggressive and controlling, while Megan is detached and unfaithful, maintaining affairs with numerous men, including her psychiatrist, Dr. Kamal Abdic (Édgar Ramírez).
While passing by the neighborhood one day, a drunk Rachel spots Megan kissing Abdic on her balcony and becomes infuriated by what she perceives as Megan “ruining” her perfect marriage. After a drinking binge, she leaves the train to confront Megan, only to black out and awaken hours later at her apartment, injured. Rachel later finds out that Megan is missing and presumed dead, and is questioned by Detective Sergeant Riley (Allison Janney), who suspects Rachel might be involved due to her recent erratic behavior.