Pregnant, abandoned by her slimy husband and destitute, Helen Georgesson boards a train going west. In the crowded train car she meets happy newlyweds Patrice Hazzard, also expecting, and Hugh. They are on their way to visit Hugh's parents, whom Patrice is meeting for the first time. After Patrice hands Helen her wedding band so she can wash her hands in the rest room, the train crashes, killing the Hazzards, but Helen survives. When she regains consciousness in the hospital, she discovers she has been mistaken for Patrice. Patrice's wealthy in-laws send for Helen, and she decides for the sake of her son to go along with the misunderstanding. They welcome her into the fold and her "brother-in-law" Bill even shows signs of romantic interest. But when her husband tracks her down and threatens her with blackmail, her dream turns into a nightmare.