The devil and the water sprite, typical Czech characters, play the leading roles in today's fairy tale. They were invited to the castle by Lord Nesvít himself to help him win the hand of Lady Luzmila from the Cloud Kingdom. However, Nesvít is not so much interested in her as in her gold. But Luzmila is cut from the same cloth. And so the devil and the water sprite are there to find out who has a black soul and who needs help. But in the process, their magic causes a lot of confusion...