A turbulent comedy of confusion about the water sprites who go soul hunting in the river Vltava and become ordinary mortals through all kinds of misadventures.

In Prague, in a house on the banks of the river Vltava, live the last seven Bohemian water sprites. The immortal beings, who keep the souls of the drowned in fragile porcelain vessels, look like ordinary citizens, but they feel more and more threatened in their existence. They themselves are not entirely innocent of this development, for if a water sprite falls in love with a human being or eats blood sausage, his immortality is over. At a congress of Aquarians it becomes clear that the situation in Bohemia is particularly critical. In fact, there are no more offspring there - except for the water girls Jana and Polly. It is therefore necessary to protect them from human influence by all means. When Jana commits the imprudence of falling in love with the young lawyer Jindrich Mrácek, there is only one question left for her family: "How to drown Dr. Mrácek?". To make matters worse, he is also responsible for getting the water spirits out of their damp house, where they feel particularly at home, in order to move into a better and more comfortable flat. That is reason enough to get rid of the culprit as soon as possible.

There are still water spirits among us. One group lives in Prague, led by Mr. Wassermann, who is using his wife's family as servants. All they need is their old house near the river. But the house is to be demolished. They have to stop it. And the only way is to drown Dr. Mrácek, who is responsible for the demolition. But he falls in love with Wassermann's niece Jana. He changes to a fish, is mistaken for the water spirit from Germany, is drowned and revived again. The other problem is the flour with ears... and so on...—Hyena