October 1997: Two young couples are camping in the German-Belgian border area. Two days later, one of the couples is found dead in the woods, while the other remains missing. Present day: Cologne reporter Jan Römer covers the murders in the "Unsolved Criminal Cases" section. What happened that night in the Ardennes? Did the second couple fall victim to the same perpetrator, or did they kill their friends and go into hiding afterward? Together with his best friend Mütze, Jan Römer begins to investigate - and stirs up a hornet's nest...