The retired commissioner Rudolf-Günther Böhnke must leave his tranquil Eifel village of Huppenbroich to solve the murder of Peter von Sybar, a wealthy gingerbread producer from Aachen who was set to become the prince of the cash-strapped revelers in Cologne. Should the murderer be sought in the carnival, professional, or private sphere? Böhnke investigates amidst the hustle and bustle of the fifth season and gains astonishing insights behind the scenes of the festive traditions.