A cheerful fairy tale with songs about magic and a tangled search for a missing baron. All it took was one petty argument, a little absent-mindedness, and Lady Valentina of the princely Rybenský family accidentally turned her fiancé, Baron Lumír Mokřenský, into a donkey. Such a mishap must be kept secret, especially since Valentýna has no idea how to reverse the spell. She prefers to let everyone think that Lumír ran away before the wedding and that she keeps the donkey as a pet...