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.
| Actor | Role |
|---|---|
| JJean BurgotRenard | Renard |
 Yves Peneauthe Occupational Physician | the Occupational Physician |
| JJean-Pierre GrenierNarrator (voice) | Narrator (voice) |