An intense love affair develops between a married concert violinist (Gösta Ekman) and his daughter's music teacher (Ingrid Bergman).

Old fashioned teachers are taught swing dancing by a student.

Kajan, a young boy, spends the summer with his friends working on a barge, earning extra money in the ports with their song and dance number. A young countess runs away from home and joins Kajan and his friends.

John Smith is an accountant at a stockbroking firm, where the firm ends up in the liquidity crisis because of his managerial speculation with the firm's money. The bank wants John to take over leadership of the company.