A vicious series of poison-pen letters spreads rumours, suspicion and fear among the inhabitants of a small French town, and one after another, they turn on each other as their hidden secrets are unveiled - but the one secret that no-one can uncover is the identity of the letters' author...
- Genres: Drama, Mystery, Crime
- Actors: Ginette Leclerc, Pierre Fresnay, Micheline Francey, Héléna Manson
- Director: Henri-Georges Clouzot
- Country: France