The Girl on the Train is a 2016 American psychological thriller mystery film directed by Tate Taylor and written by Erin Cressida Wilson, based on Paula Hawkins' 2015 debut novel of the same name. The film stars Emily Blunt, Haley Bennett, Rebecca Ferguson, Justin Theroux, Luke Evans, Allison Janney, Édgar Ramírez, and Lisa Kudrow, and follows an alcoholic divorcée who becomes involved in a missing persons investigation.
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 that she only later learned about from Tom, and to which she attributes the ending of their marriage, in addition to her being sterile.
Rachel shares an apartment with her friend Cathy (Laura Prepon) and spends her days commuting on a train, often 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, Rachel spots Megan kissing Abdic on her balcony and becomes infuriated by what she perceives as Megan's ruining her "perfect" marriage. After a drinking binge, Rachel 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.
Rachel, pretending to be a friend of Megan's, approaches Scott and tells him about Megan's affair. Scott identifies Abdic as Megan's lover. Believing Abdic is behind Megan's disappearance, Rachel schedules an appointment with him, wherein they discuss Rachel's troubled relationship with Tom, particularly an incident in which she lashed out at an office party and aggravated Tom's boss's wife Martha (Lisa Kudrow), leading to Tom being fired......
• Emily Blunt...... as Rachel Watson
• Haley Bennett...... as Megan Hipwell
• Rebecca Ferguson...... as Anna Watson
• Justin Theroux...... as Tom Watson
• Luke Evans...... as Scott Hipwell
• Allison Janney...... as Detective Sgt. Riley
• Édgar Ramírez...... as Dr. Kamal Abdic
• Lisa Kudrow...... as Martha
• Laura Prepon...... as Cathy
• Darren Goldstein...... as Man In The Suit