Librarian Roger Fleuriot is in love with princess Saint Labiche but doesn't dare admit it because of their different classes. The princess feels the same way and invents a twin sister that works in a shoe shop that she pretends to be in order to seduce him.
Emma Klink is devoted to preserve morality in 1912 and she is also a chairwoman for "The support for unmarried mothers". Her husband is a mustard manufacturer who has had a secret affair with a Spanish dancer twenty-five years earlier. His mistake is that he confides in a semi-senile vicar, and when a strange young man suddenly appears shouting "Daddy!" chaos enters the once peaceful house.
A young princess falls in love with the castle's young music teacher, Roger Fleuirot, but he is shy and does not dare to show his love for her. When the music teacher goes to Paris, the princess follows him and pretends to be her own twin sister, who works in a shoe shop. Nils Poppe plays the cheerful shoemaker Fabian Filosel.
