One day, a mysterious servant named Dorian appears in the hut of the magician Boniface as an inheritance from Boniface's uncle. Dorian, punished for his pride, is a man by day and a cat by night. Part of his uncle's legacy is also a magic book, with the help of which Boniface begins to prosper. Dorian secretly discovers how to break his spell: he must find a girl with a heart of gold. Princess Ludmila from a nearby kingdom has such a heart, which she wears as a pendant. Dorian persuades the magician Boniface to use his magical powers to kidnap Princess Ludmila and make her his housekeeper. But the princess's bold and fearless maid, Anděla, easily deals with Boniface. And, of course, Dorian soon falls in love with the princess...