At St. Catherine's Children's Home, the other orphan girls tease Janet for insisting that she has a father who will come for her soon. Determined to prove his existence, Janet runs away from the home. Confused by the noise of the city, she walks into the street in front of a car and faints from fear. On the other side of town, gamblers Nails Morgan and Todd Harrington are racing to get a bet down before the track closes. They race behind the ambulance that is hurrying to Janet's accident, and when they are stopped by the police for speeding, Todd pretends that Nails is the girl's father. O'Reilly, a sympathetic policeman, escorts them to the hospital. When Janet hears that Nails is her father, she recovers from her shock immediately and insists that he take her home. Because O'Reilly is standing right there, Nails has no choice but to take her with him. Janet is so adorable that Todd and Madge Perry, Nails' girl friend, both want to keep her, but Nails insists that she must return to the orphanage as soon as possible. When Nails, accompanied by Janet, wins a lot of money in a crap game, Madge realizes that if Nails believed that Janet was good luck, he would keep her. She arranges for Janet to suggest a bet on a horse that she knows will win, and when it does, Nails agrees to keep Janet with him. Meanwhile, O'Reilly visits with his daughter Kathleen, assuming that Madge and Nails are married. Discovering the truth from Nails's landlady, he forces them to marry. Nails, Madge, Todd and Janet leave for California, where Janet's good luck eventually wins a race horse. Janet's picture is printed in the paper because the orphanage has reported her missing, sending both O'Reilly and some gangsters in search of Nails. The gangsters threaten Nails with the loss of Janet if her horse wins a race. At the race, the officials notice the jockey pulling the horse and Nails, Todd and Madge are arrested. In court, Janet's love for Nails is so apparent that the jury exonerates them all. The judge insists, however, that Nails get a regular job, and to Janet's delight, he agrees.