The farmstead of the former police officer Willi Hantel ( Horst A. Reichel ) is on fire. It quickly becomes clear that the fire was only brought about to cover up the murder of Willi Hantel. Commissioner Lucas ( Ulrike Kriener ) and her team initially suspect the perpetrator among the family when Walter Gussmann ( Robert Giggenbach ), a second police officer, is found murdered, leads a hot trail to Rudolf Katz ( Nicolas Flocken ). Transferred by Hantel and Gussmann of the murder, Rudolf Katz was in prison for a long time, innocent, as he always claimed.
A late vengeance campaign? cat is untraceable, but the research in the past case leads to a new main suspect: the senior investigator from back then, today's Regensburg police chief Ernst Schenker ( Heiner Lauterbach ), who puts pressure on Ellen Lucas as her superior. Schenker also forbids Ellen Lucas to deal with his daughter Susanne ( Jasmin Difficulties ), who has been lovingly taking care of Ellen's comatose husband Paul ( Germain Wagner ) for some time. Susanne then visits and Privates mixes dramatically with the requirements of the current case.