A murder is committed in the building where Aurélia Maudru, inspector of the judicial police in charge of the investigation, lives.
| Actor | Role |
|---|---|
 Bernard GiraudeauMax Queryat | Max Queryat |
 Anny DupereyAurélia Maudru | Aurélia Maudru |
 Charles BerlingInspector Focard | Inspector Focard |
 Daniel EmilforkJulius Zepernick | Julius Zepernick |
| AAndré BernierOswald Stricker | Oswald Stricker |
| MMarie-Ange DutheilMadame Viana | Madame Viana |
 Alain FlickAnge Auber | Ange Auber |
 Éva IonescoPauline | Pauline |
 Idwig StephaneRaoul Queyrat | Raoul Queyrat |
 Jean-Paul ComartWillemsen | Willemsen |
| RRoger DutoitPrinz | Prinz |
 Alexandre von SiversJeweler | Jeweler |
 Lydia BillietNot listed | Not listed |
| MMichel LechatNot listed | Not listed |
| RRoland De PauwNot listed | Not listed |
| LLéon LevieuxNot listed | Not listed |
 Michel IsraëlNot listed | Not listed |
| CCharles MartigueNot listed | Not listed |
| AAlain LahayeNot listed | Not listed |
| RRoger MidroletNot listed | Not listed |
 Stéphane AuberghenNot listed | Not listed |
| RRosalia CuevasNot listed | Not listed |
| MMarius BabarNot listed | Not listed |
 Marianne BaslerNot listed | Not listed |
| OOdile HuhardeuxNot listed | Not listed |
| JJohn HeusseNot listed | Not listed |
| DDenise VolnyNot listed | Not listed |