Prince Louis Ottomar Charles XII, born Noble, is very close to his loving mother, Queen Ludmilla. However, Prince Louis is already a bit too old, he is 39 years old. He's afraid of almost everything, doesn't want to get married, and spends most of his life hanging around the sumptuous castle and adjacent fields. The wise King Radomil therefore prepares an unexpected gift for him - the prince wakes up one morning in the forest in ordinary clothes and, accompanied by the rough knight Hudroval, he is to go out into the world to learn what life is all about and perhaps finally grow up. On his great journey of adventure, he will encounter things he has only read about in books. He will meet a powerful wizard, evil witches, a ghost, and the Lady Death herself... and maybe even find the love of his life. What will Mummy say about all this? And will Father King be happy?

The new owner Štěpán arrives at the castle at the foot of the Krkonoš Mountains with his fiancée, the beautiful countess Blanka, and his younger brother Adam. There is another new visitor in the mountain town, the ethnographer Jiráček, who collects local legends and is amazed that the local people still believe in Krakonoš. Štěpán's carriage knocks down a passing girl, whom Adam helps and she falls in love with him. Will Liduška's love for Adam come true? What mystery does the painting at Hůrka Castle hide and what terrible thing once happened in the mountains? Who will decipher the mysterious marks of the Italian book? And who is Krakonoš and what is his biggest secret?

Czech painter and illustrator Alphonse Mucha (1860-1939) ranks among the pioneers of the Art Nouveau movement at the end of the 19th century. Virtually overnight, he becomes famous in Paris thanks to the posters that he designs to announce actress Sarah Bernhardt’s plays. But at the height of his fame, Mucha decides to leave Paris to realize his lifetime project.