D’Artagnan is forced to join forces with Milady to save Constance, who was kidnapped before his eyes. But as war is declared and Athos, Porthos and Aramis have already joined the front, a secret from the past shatters old alliances.
- Casting: Eva Green, François Civil, Lina Khoudri, Patrick Mille, Pio Marmaï, Romain Duris, Vicky Krieps, Vincent Cassel
- Production déléguée: Chapter 2, Pathé
- Studio VFX: IIW Studio, Mac Guff
