Albert-Etienne Montigny claims to have accidentally hit Doctor Gerberoy with his car. The investigation reveals that Montigny was convicted twice for illegal practice of medicine, following Gerberoy's testimony.
Roger Montvillers is accused of the murder of Paul Fontet, a supervisor like him in the PNS company. Promoted to workshop leader, he makes life difficult for his workers. Fontet would like to close the workshop and lay off the staff.
Michel Heurteloup. son of a farmer, is accused of the murder of Moise Alleaume, the neighboring farmer. The investigation reveals that the two families accuse each other of using occult practices to cause damage to their adversaries.
