I have come to cast fire upon the earth! It all begins with lifeless bodies in the Gifiz Lake in Offenburg, as well as mysterious signs, letters, and numbers. Is it just a warning against moral decay? A young commissioner suspects more and investigates on his own. When he is found dead, Chief Inspector Berger and his colleague Tammy from the "Soko Gifiz" take over the investigation. The investigators are initially misled. But then Berger uncovers frightening connections...