The sisters Britta and Ellinor live with their grandfather, music professor Libergius, teacher and leader of the city's orchestra association. In the city there is also a youthful jazz band - to the professor's horror.
The Björcks are an ordinary middle-class family in a large Stockholm apartment with with two children, Greta and Ville. But the family's happiness is threatened in two ways: Greta prefers Börje Schack instead of the well-behaving Bertil. And the flirtatious Mrs. Holten tries to snare Mr. Björck.
Inga Danell's summer vacation is near. But unfortunately both Inga and her brother Acke have bad grades and are forced to study by the help of a tutor.
The stern, but kind-hearted, Kristiana from the country takes place as a maid with the Larsson family in Stockholm, previously (in)famous for its rapid turnover of housemaids.
The annual music competition organised by Swedish public broadcasters Sveriges Television and Sveriges Radio to determine the country's representative for the Eurovision Song Contest.