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.
This castle has its own ghost - a mysterious White lady. She emerges from the painting on the wall when someone speaks out magic formula. White lady is good ghost, she can make someone's wishes true. Even if it is a new duct. But a miracle is not the thing that Communist leaders want in the town.
Wandering through the forest, a woodcutter finds a golden fern whose seed turns into a beautiful woman - they fall in love. After getting drunk in a village feast, he gets to sign up to the army. The fairy gives him a shirt to wear and asks him to swear he will never abandon it. At the war front, he falls in love with the the colonel's daughter and will have to perform various feats to get her attention.
Film shows the struggle of the Czechoslovak armed forces against groups of Ukrainian Insurgent Army (UPA) under command Burlak, who tried to pass through the territory of Slovakia.