Having recently moved into her new apartment, Irène Cazenave, the widow of a well-known police officer, is forced by one of her husband's colleagues to take part in an investigation. The building's provocative concierge has been found murdered. We watch a parade of suspects, only to learn at the end that Irène killed the janitor under blackmail. She kills herself.
| Actor | Role |
|---|---|
| GGeorges RandaxL'inspecteur principal Marc Brénot | L'inspecteur principal Marc Brénot |
 Madeleine RobinsonIrène Cazenave | Irène Cazenave |
 Erich von StroheimLe professeur Kieffer | Le professeur Kieffer |
 Francis BlancheM. Boulay, l'épicier libidineux | M. Boulay, l'épicier libidineux |
| MMary MarquetLa vieille Madame Vignot | La vieille Madame Vignot |
 Jean CarmetMerle, l'adjoint de l'inspecteur | Merle, l'adjoint de l'inspecteur |
 Jean-Jacques DelboMartin, le masseur | Martin, le masseur |
| NNicole GammaCatherine | Catherine |
| CClaude RomainJosé "Jo" Kieffer | José "Jo" Kieffer |
 Evelyne CormanNot listed | Not listed |
| NNicole DelageNot listed | Not listed |
 Rosy VarteMme Boulay, l'épicière | Mme Boulay, l'épicière |
 Charles VissièresLe concierge | Le concierge |
| PPierre GoutasNot listed | Not listed |
 Claire GérardLa buraliste | La buraliste |
 Louis BugetteNot listed | Not listed |
| SSimone ClarisNot listed | Not listed |