In this musical drama, a child is abandoned upon the San Francisco docks but is found by some kindly fisherman who take him in and raise him. His life is happy until the fisherman's sister-in-law moves in after her husband dies. She brings her bratty son with her. This upsets the orphan so much that he runs away. The fisherman launches a huge city-wide search , finds the sad lad, and finally brings him back home.