Graf Yoster gibt sich die Ehre [French title: Le comte Yoster a bien l'honneur] is a TV series which followed the adventures of the title’s amateur gentleman detective. It was a success in particular in Germany and in France. Originally the show was a German production in black-and-white but it evolved into a European co-production in colour.

The Castle of Olive Trees is the ancestral home of the "Laborie de Sauveterre". Located at "Châteauneuf-du-Pape", it holds many mysteries and legends. Like every summer "Estelle Laborie" goes there to take some time off. But this summer she take an important decision: run from Paris and stay here at the castle definitively. Little does she knows that her arrival will awake a lot of drama and secrets, beginning with this enigmatic "Pierre Séverin" who wants to demolish the castle to the ground, to make an amusement parc "Cigaleland". She will learn unfortunately that this "Pierre Séverin" is also knowned as "Marceau" the little boy of the steward of the castle when her father was the master of the domain. That steward also died in terrible circumstance. However Estelle decides to face this vengeance and save the castle with the aid of archaeologist "Raphaël Fauconnier"...

The series follows the adventures of lighthearted Jean-Paul Moulin, a police Commissaire, and his team as they solve crimes.