Dora Mills, an employee in the big office of Alexander Taylor, goes with some friends to a neighborhood dance hall where she unknowingly meets the son of her employer, Ralph Taylor, who has just returned from college for his Christmas vacation. The two people have a love affair, sincere on Dora's side, but not so with Ralph, who is not aware of her employment in his father's office. When the child comes, Dora is driven from her home and is the social derelict and outcast. While this is going on young Taylor marries Florence Lalor, a society girl. When Dora has no way to turn she sums up courage and goes back to the place of her old employment and there through the help of her forelady, who likes her, she gets back her old job. Dora is in ignorance of her betrayer until one day when she happens to see on her employer's desk a picture of a man and woman and a baby. She learns the truth and seeks revenge. Florence, young Taylor's wife, calls up the office and asks for a stenographer. Dora is sent. She arrives in the home of her betrayer. Young Taylor comes in while his wife is upstairs, and there is a scene when he tries to buy Dora off. When Taylor goes out that evening with his wife, Dora stops her work, rushes upstairs, grabs the baby, and wants to kill it. Then a better thought strikes her, a thought for a complete revenge. She rushes back to her hovel, grabs her own infant, hurries back to the home of young Taylor, puts her own child in the crib where she feels it rightfully belongs and is on the point of rushing away with the Taylor baby when she faints. She is found by the Taylors when they return home. There are explanations. Dora denounces the man who forsook her, and Florence drives the man who ruined Dora from her side and takes Dora in her arms for protection.