La cité de l'indicible peur (La grande frousse)

On the trail of an escaped forger, the debonair Inspector Triquet arrives in Barges, an imaginary village in Auvergne. He discovers a local population terrified by the reappearance of a legendary monster, "the Bargeasque".

Directed by: Jean-Pierre Mocky (France, 1964)
Screenplay by: Jean-Pierre Mocky, Gérard Klein
Based on the novel by Jean Ray.
Cast: Bourvil (Police Inspector Simon Triquet), Francis Blanche (Franqui), Jean Poiret (le Sergeant Loupiac), Jean-Louis Barrault (Douve), Jacques Dufilho (Gosseran), Victor Francen (Dr Clabert), Raymond Rouleau (the mayor)
Genre: thriller