The former BKA investigator "Bernhard Maus" is constrained at its very first day of his superior "Strehlitz" to take a mysterious murder case . He must work with Commissioner Valentin from Homicide Unit Altona , where nobody has sympathy for his unconventional methods of investigation . The number of victims is growing . It comes to a robbery in his own apartment , which offset his girlfriend in fear and it almost cost the life itself . After several chases across Hamburg and encounters with quirky suspects , advised the two Commissioners in a deadly trap.—Kai-Uwe Wedel