Brothers Fredrik and Pontus own a family company. Fredrik is the manager of the old school and Pontus is a professor of psychology, which theorizes that men is more intelligent than women. Astrid, a young woman, opposes these theories and Pontus decides to hires her, which Fredrik doesn't like. Astrid gets installed as in charge of advertising, and soon she begins her modernizations.

A gang of unemployed itinerant musicians play in the south of Stockholm. Then they get the chance to be an orchestra in a dance restaurant. It goes well until the female owner falls in love with one of them.

Old fashioned teachers are taught swing dancing by a student.

Karl and Ada are engaged, Gustaf is a sailor and in love with Elsa. For her sake he's willing to stay ashore.