The young Prince Charles (Jaromír Hanzlík), the future King of his country Charles IV, is being educated at the French court in the company of his fiancée Blanche (Daniela Kolárová). One day he receives a summons from his father John of Luxembourg (Milos Kopecký) in Italy. He leaves for Italy accompanied by a deputation from Bohemia. On the way the prince's company fights a battle with armed Milanese against heavy odds. Thanks to Charles's perspicacity, the prince's almost naked soldiers win through. In Lucca in Italy Charles joins his father, and here he experiences an amorous adventure and escapes from the traps laid by the Italian rebels.

The happenings in a shoe factory serve as a not very thinly veiled examination of the pros and cons of both socialism and democracy.

In late 19th century Czech-speaking Bohemia, oppressed workers at German-owned mines and foundries revolt against their harsh working conditions. Made shortly after World War II as Czechoslovakia was falling to communism, the film resonates in Czech resentment of the German occupation.