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The girl on the train is Rachel, a lonely, alcoholic divorcée who rides the train to and from London each day, hoping to keep her long-suffering roommate from discovering that she’s been fired from her job. The train, cruelly, passes each day by the house where she once lived with her adored ex-husband, Tom. He still lives there with the woman he left her for and their small child. Rachel directs her focus a few houses down, where another young couple lives, envying their seemingly blissful partnership. One day, she is shaken by what she sees at the couple’s house — and soon after, the wife disappears. Rachel, convinced the event she witnessed is relevant to the case, is quickly drawn into the mystery, but her debilitating alcoholism and the blackouts caused by her binges make her an unreliable witness, untrusted by the authorities and even by herself.