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.
L'inspecteur principal Marc Brénot
Irène Cazenave
Le professeur Kieffer
M. Boulay, l'épicier libidineux
La vieille Madame Vignot
Merle, l'adjoint de l'inspecteur
Martin, le masseur
Catherine
José "Jo" Kieffer
Mme Boulay, l'épicière
Le concierge
La buraliste
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