A documentary film about occupational diseases shot in 1957 at the Francolor factory in Oissel. It takes the form of a scientific investigation to discover the origin of a mysterious illness that has infected a worker at the factory.
| Directing | Alain Resnais | Director |
| Directing | André Heinrich | Director |
| Sound | Pierre Barbaud | Original Music Composer |
| Camera | Sacha Vierny | Director of Photography |
| Production | Jacqueline Jacoupy | Producer |
| Editing | Anne Sarraute | Editor |
| Camera | Ghislain Cloquet | Director of Photography |
| Writing | Rémo Forlani | Scenario Writer |
| Writing | Chris Marker | Writer |