Marie Lemaire is poisoned during a dinner that brings together an association of merchants. She is the heiress of her recently deceased husband, François, who was the owner of the largest glass factory in the city. All the guests are potential suspects and the investigators must sort out the real from the fake, detect motives and verify alibis. Olivia Rousseau, one of the guests, ex-mistress of François Lemaire who left her to marry Marie, is dead at her home. In a letter, she declared that she had poisoned Marie and killed herself in the same way.
| Actor | Role |
|---|---|
 Florence PernelÉlisabeth Richard | Élisabeth Richard |
 Lola DewaereCaroline Martinez | Caroline Martinez |
 Guillaume CramoisanCapitaine Charles Jouanic | Capitaine Charles Jouanic |
 Marianne BaslerOlivia Rousseau | Olivia Rousseau |
 Louise PasteauMarie Lemaire | Marie Lemaire |
 Florent PeyreGrégoire Spaletta | Grégoire Spaletta |
 Stéphane BlancafortSerge Pellegrino | Serge Pellegrino |
 Matthieu BurnelJérôme Leclerc | Jérôme Leclerc |
 Gwendolyn GourvenecClémence Roux | Clémence Roux |
 Charlie JoirkinJulie Caron | Julie Caron |
 Jérôme PoulyStéphane Caron | Stéphane Caron |
 Raphaël FerretHugo Fontaine | Hugo Fontaine |
 Hervé DandrieuxAurélien Ferrero | Aurélien Ferrero |
 Pierre LopezVirgile Coleville | Virgile Coleville |
| SSimone NaselloRicco Martinelli | Ricco Martinelli |
 Noëlle PernaYvette | Yvette |
 Jean CorsoNotaire | Notaire |
 Louis-Emmanuel BlancKevin Lestrade | Kevin Lestrade |
| MMichel SisowathMédecin SAMU | Médecin SAMU |