A mysterious figure signing himself "The Ferret" keeps sending letters to the police, tipping them off about murders that are to be committed around Paris. Among those caught up in the police manhunt is a fraudulent clairvoyant.
Jany Holt
Cécile
Colette Darfeuil
Louise Heller
Pierre Renoir
Doctor Dauvel-Juste
Jacques Baumer
Commissioner Hyacinthe
Jean-Jacques Delbo
Ludovic
Pierre Larquey
Mr. Thiais