One evening, professor André Barret sees the author of a murder in the darkness; cafe owner Cordelec is the victim. From then on, his suspicions fall on one of his students who had just arrived in his class, Bernard Cormiere.
Bernard Cormière
Pascale Barret
André Barret
Investigating judge
Grindel
Rudeau
Lachaume
Pélissier
Police commissioner
Madame Lachaume
Henriette
Madame Bergamier, mother-in-law
Tobacconist
Internal
Newspaper carrier
Cardelec
Coffee boy
Agent
Left-luggage employee
Josette