A historian seeks to clarify the mysterious death of Sire de Malvaleix and will find himself involved in the murder of the current descendant.
Professor Barbaroux
Madame Barbaroux
Madame de Hennebelle
Commissioner Plachon
Gérard
The Lieutenant of the Gendarmerie
Marquis
The cook
Mona Lambelle
Christine
Orfray
The valet