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.
| Directing | Victor Vicas | Director |
| Writing | Jacques Companéez | Writer |
| Sound | Joseph Kosma | Music |
| Editing | Jean Feyte | Editor |
| Crew | Pierre Montazel | Cinematography |
| Writing | Victor Vicas | Writer |
| Writing | Jean Hougron | Novel |