An aspiring singer tries to break into films during the early talkie era. She is hired to dub the singing and speaking voice of a silent-movie favorite. Sworn to secrecy, the fill-in must stand by in silence as the star receives all the praises and plaudits.
| Actor | Role |
|---|---|
 Édith PiafMadeleine | Madeleine |
 Marcel HerrandRoger Marney | Roger Marney |
| JJules BerryBilly Daniel | Billy Daniel |
 Serge ReggianiGaston Lansac | Gaston Lansac |
 Mila ParélyStella Dora | Stella Dora |
 Yves MontandPierre | Pierre |
 Colette BrossetLulu | Lulu |
 Georges VitrayLe producteur Darnois | Le producteur Darnois |
 Mady BerryMélanie | Mélanie |
 Paul Frankeurle reporter | le reporter |
 Renée DennsyNot listed | Not listed |
 Pierre MindaistNot listed | Not listed |
| JJean RaymondNot listed | Not listed |
| PPierre FarnyNot listed | Not listed |
| GGinette CantrinNot listed | Not listed |
| JJuliette CransacNot listed | Not listed |
| GGeorges YvonNot listed | Not listed |
| JJean RozembergNot listed | Not listed |
| PPierre Cadot(uncredited) | (uncredited) |
 Philippe Lemaire(uncredited) | (uncredited) |
 Liliane Lesaffre(uncredited) | (uncredited) |
| CCécyl Marcyl(uncredited) | (uncredited) |
 Colette Renard(uncredited) | (uncredited) |
 Marcel Rouzé(uncredited) | (uncredited) |