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.
