A highly sensitive musician and a Rhineland commissioner investigate along the coast and encounter a perpetrator who sets deadly traps. A serial killer abducts his victims to play a sinister game: only through brave and clever actions can they escape death. The Husum commissioners Flottmann and Hilgersen face a mystery. What is the motive of the perpetrator, and how can the madness be stopped? Can musician Leon Gerber, with his highly sensitive hearing, provide valuable clues in this case as well? A race against time begins.