During a performance at the Château de Blois, an industrialist is murdered as he plays the role of Henri III. Arthur, the young actor playing the Duke of Guise, becomes prime suspect. Police Captain Alice Deschamps heads the investigation with her ex and Arthur's father, Detective Inspector Denis Frécant.
| Actor | Role |
|---|---|
 Anne CharrierAlice Deschamps | Alice Deschamps |
 Olivier MarchalDenis Frécant | Denis Frécant |
 Boubacar KaboKévin 'Je note tout' | Kévin 'Je note tout' |
 Elias HauterArthur Frécant | Arthur Frécant |
 Hubert DelattreGaspard Maréchal | Gaspard Maréchal |
 Élodie HesmeAna de Navelle | Ana de Navelle |
 Albert GoldbergJean-Yves Bellion | Jean-Yves Bellion |
 Linda CormierJoana Dimova | Joana Dimova |