A playwright has to murder if he does not want to be murdered.
| Actor | Role |
|---|---|
 Jean PoiretLouis | Louis |
 Roger PierreGermain Lormond | Germain Lormond |
 Michel SerraultRossignol, private detective | Rossignol, private detective |
 Mireille DarcJosette | Josette |
 Stéphane AudranRika Lormond | Rika Lormond |
 Claude ChabrolPsychiatrist | Psychiatrist |
 Hubert DeschampsRobert Darsac | Robert Darsac |
 Olivier HussenotTheater director | Theater director |
 Max MontavonHomosexual | Homosexual |
 France RumillyRaymonde | Raymonde |
 Fernand SardouInspector | Inspector |
 Marcel AchardSelf (uncredited) | Self (uncredited) |
 Philippe CastelliCritic (uncredited) | Critic (uncredited) |
 Jean DegraveProsecutor (uncredited) | Prosecutor (uncredited) |