A dead teenager on one side of the Rhine, a hastily filed death case of an elderly lady on the other, and a dark story that remained untouched for decades – what connects these cases? Chief Inspector Karin Krafft resorts to unconventional investigative methods, colleague Gero von Aha operates undercover as a "Rosenkavalier," and then there are the three from the O.P.A. initiative, who tend to heroic deeds and already caused confusion in "Die Füchse.".