The story follows the plight of Lady Isabel Carlisle, who is married to Archibald Carlyle and has two children. A villainous character, Captain Levison, manipulates her into believing her husband is unfaithful. Driven by mistaken reasons, she leaves her family. The train she is on subsequently crashes, and she is believed to have died in the wreck.
Having survived, she secretly returns to her former home in disguise (wearing a wig and sunglasses) and takes a job as the governess to her own children. The film explores themes of long-suffering and regret as she lives in the household unrecognized by her family.