The Rostock-based inspectors Alexander Bukow and Katrin König are investigating in a brutal murder case. The victim, a teacher, died from having his tongue cut out and choking on the blood. Initially it seems that the Russian mafia is behind the torturous murder, and another clue leads to the S&M scene in Hamburg. But the investigations come to nothing. Then Katrin König is assaulted and Bukow and his family are threatened by a stalker as the case begins to run wild in a nerve-racking race against time.