Agathe is turning 30 and has finished her thesis on secret societies in France. A young woman is found dead in the Seine, murdered for a specific ritual. She is an image of Agathe, has the same first name and is similarly dressed. The traces lead to one of the secret societies this included in Agathe's study.
| Actor | Role |
|---|---|
 Cécile BoisAgathe Verdier | Agathe Verdier |
 François VincentelliYann | Yann |
 Constance DolléEmma | Emma |
 Béatrice AgeninÉlisabeth | Élisabeth |
 Thomas JouannetAntoine | Antoine |
| FFrançois-Régis MarchassonPierre Bouvier | Pierre Bouvier |
 Féodor AtkineMonnier | Monnier |
 Philippe LaudenbachMarcennac | Marcennac |
 Michel JonaszAlexis | Alexis |
 Philippe KrhajacStanislas | Stanislas |