The Squadron leader throws big a party where one of his colleagues is going to demonstrate a new type of explosive substance.
Celestin is the singing teacher in a monastery and Denis is one of her students. They both dream about the life outside. (It's a Swedish version of the famous vaudeville-opérette "Mam'zelle Nitouche").
The Danish school teacher Mogens Jensen is on his holiday through Sweden in a rickety T-Ford.
