Mr. and Mrs. Delmar, with their little daughter Mamie, live very happy, although in humble circumstances. The new baby arrives, but Mrs. Delmar dies in giving it birth. Mamie becomes a little mother to the baby. She does the housework and cooks her father’s meals. Her father meets with an accident and is killed. Mamie and her baby brother are placed in the charge of the Orphans’ Home. A year passes and Mamie and her baby brother are still at the Orphans’ Home. Mr. and Mrs. Calvert, well-to-do people, have lost their little baby by death. They adopt a child from the home, and unfortunately (as Mamie thinks) their choice falls on Mamie’s brother. He is taken away in a fine automobile, and poor little Mamie’s heart is broken. Going to the matron’s room, Mamie discovers the address of the Calvert’s and follows on foot, steals the baby in its baby carriage during the absence of the servant. The police are asked to search for the child. Mamie and the child are found asleep under a tree and taken to the station house where Mr. and Mrs. Calvert are waiting. They are overjoyed at the recovery, and hearing poor little Mamie’s story, conclude their hearts are big enough for two children.