Lucerne in February, at carnival time. The whole night is celebrated exuberantly. Only Reto Flückiger (Stefan Gubser) wants one thing above all: to leave the noisy city as quickly as possible. But nothing will come of it. Franz Schäublin (Peter Hottinger), head of the Lucerne building committee and active member of the guild of the guards on Pilatus, is stabbed to death in the early morning of Dirty Thursday in the middle of the exuberant carnival hustle and bustle. Witnesses saw a figure dressed as Death run away from the scene. Schäublin was considered a respected and honorable citizen of the city. However, initial investigations by the police show that Schäublin apparently had two faces. Now his escapades, which he was able to hide perfectly during his lifetime, threaten to come to light.
Did Schäublin allow himself to be blackmailed in order to continue to keep his extravagant lifestyle secret? In search of the culprit, Reto Flückiger and Liz Ritschard (Delia Mayer) go into the hustle and bustle of the city trembling with carnival fever. They try to unmask and unmask until they realize that the killer has been fooling them so far and everything is very different than it first seemed. "Dirty Thursday" is the third case in which Stefan Gubser is investigating together with Delia Mayer in Lucerne. Her permanent staff also includes Anna Schinz, Sabina Schneebeli, Martin Klaus, Matthias Fankhauser, Andrea Zogg, Jean-Pierre Cornu and Suly Röthlisberger. Actors such as Ueli Jäggi and Monica Gubser or Peter Zumstein and Karin Pfammatter appear in guest roles.
And young talents like the film and theater actress Carol Schuler and new discoveries like the 30-year-old theater actor Andri Schenardi are also part of the cast. "Dirty Thursday" is the first film that Dani Levy made in Switzerland.