6-year-old Bi is afraid of water ever since her younger brother drowned in a flood. Her father, Karl Klingert, devoted himself to designing the first diving suit in the world. Bi thinks that the suit is a monster manipulating her dad. With the help of Peter, a young rascal from the riverside, she wants to destroy the invention before the whole family moves out of Wrocław forever.
The film is a directing debut.