Four classmates decide to perform a love song that their friend, Pierre, composed for Marie. Novac, another admirer of Marie, is murdered. Pierre suspects one of the four of being the killer, but incriminates himself, believing that Marie was in love with the killer.
| Actor | Role |
|---|---|
 Simone BourdayMarie | Marie |
| AAlain GuivelPaul | Paul |
 Aimé Simon-GirardPierre | Pierre |
 René DonnioMax | Max |
| HHenri PoussardGustave | Gustave |
 Alice TissotEmma | Emma |
| YYvonne LouisNadia | Nadia |
 María DalbaicínNadia | Nadia |
 Serge NadaudEmile | Emile |
 Maurice de CanongeNovac | Novac |
| RRené TérillacThomson | Thomson |
| MMaurice LangeCommissioner | Commissioner |
 Victor VinaJudge | Judge |