How to Drown Dr. Mracek, the Lawyer

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 Mracek, there is only one question left for her family: "How to drown Dr. Mracek?". 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.