To prove his argument that any child reared in the right atmosphere will turn out well, young millionaire John Dean adopts a child from the slums and has her raised with little Edith, the child of his friend Mr. Ellis. The children are the same age and grow up together as sisters. When they are 18, Dean returns from abroad and his pride in his young ward turns to love. They are very happy together. Edith has become infatuated with the good-looking chauffeur and Mary tries in every way to take her thoughts from him. One day she drops a letter from him in the library. Dean and her father find it, and as they are puzzling over it, Mary enters, looking for something, and to save Edith, claims the note as hers. Dean is heartbroken and Mr. Ellis says, '"I told you so." Mrs. Ellis agrees. Edith, impatient at Mary's long absence, rushes down, and seeing Mary's plight, confesses. Mary is about to go away forever when Dean rushes after her and blames himself for doubting her. He offers her his name and his heart. And as she has learned to love him, she accepts both.
—Moving Picture World synopsis