The film begins in a Berlin club with Trude Berliner singing as gangsters plan a burglary at a Hamburg hotel. At the hotel, Orbeliani leads the band while his wife Olga sings their son Jascha to sleep. During the heist, Jascha wakes, screams, and is knocked down. The gangsters flee to Berlin with stolen jewels and the unconscious Jascha. Homolka, one of the gangsters, refuses to abandon the boy, nurses him back to health, and pretends to be his uncle, claiming his parents are on an American tour. Homolka develops motherly feelings, facing ridicule from his friends and Trude Berliner.