Public prosecutor Wolfgang von Prinz (Christian Taschen) is alarmed: In his neighborhood, Ingo Broich (Torsten Peter Schnick), the managing director of the cleaning company of the same name, was stabbed to death. Everyone knows each other in the posh district of Cologne. But his wife, the lawyer Beate von Prinz (Jeanette Hein), also has close business ties to the father of the murder victim. Of course, that aroused the interest of inspectors Ballauf and Schenk. Especially since the relationship between the family patriarch Jakob Broich (Hans Peter Hallwachs) and his son was not the best: Instead of taking care of the successful company after his father's stroke, Ingo preferred to spend the nights in his poker game...