Poulet au vinaigre

In a small town in the French countryside, a young postman to strange behavior and his invalid mother and half-mad suffer repeated attacks of three local leaders to agree to sell their property ... Following an accident that is very similar to a crime, a sleuth, Inspector Jean Lavardin arrives to investigate. His very unorthodox methods allow it to soon to date a very serious business of real estate shenanigans, embellished with mysterious deaths, disappearances and dark grudges... (Wikipédia)