Tongues start to wag after a famous Parisian music hall dancer is rushed to hospital after being found poisoned by arsenic at the Concert Mayol.
| Actor | Role |
|---|---|
 Claude GodardMado | Mado |
| DDaniel ClériceMax | Max |
 Jean-Pierre KérienInspector Million | Inspector Million |
| RRobert BerriFred | Fred |
 Jean TissierMr. Grumeau | Mr. Grumeau |
 Betty BeckersNot listed | Not listed |
| CCélia CortezLydia | Lydia |
| JJane D'YvoireNot listed | Not listed |
 Jean DaurandBill | Bill |
 Paul DemangeNestor | Nestor |
| PPaul EnsiaDirector | Director |
| FFernand GilbertImpresario | Impresario |
| MMichèle GinestyNot listed | Not listed |
| AAriane LancellDancer | Dancer |
 Christian LudeDoctor | Doctor |
| GGina ManèsConcierge | Concierge |
| CCharles RoyCommissioner | Commissioner |
| MMonique VivianNot listed | Not listed |
| MMaurice Derville(uncredited) | (uncredited) |
 Albert Dinan(uncredited) | (uncredited) |
 Julien MaffreMachinist (uncredited) | Machinist (uncredited) |
| MMarcel PortierMillion's deputy (uncredited) | Million's deputy (uncredited) |
| GGeorges SauvalNeighbor (uncredited) | Neighbor (uncredited) |
| VValérie Vivin(uncredited) | (uncredited) |