The second of a two-part film adaptation of Alexandre Dumas' novel. Constance is kidnapped before D'Artagnan's eyes. In a frantic quest to save her, the young musketeer is forced to join forces with the mysterious Milady de Winter. But as war is declared and Athos, Porthos and Aramis have already joined the front, a terrible secret from the past shatters all old alliances. As the King falls further and further under the control of Cardinal Richelieu, D'Artagnan and the Musketeers are the last bastions before chaos. But, drawn into a plot that threatens to put the country to fire and sword, fate presents them with a terrible choice: will they have to sacrifice those they love to complete their mission?
D'Artagnan, a spirited young Gascon, is left for dead after trying to save a noblewoman from being kidnapped. Once in Paris, he tries by all means to find his attackers, unaware that his quest will lead him to the very heart of a war where the future of France is at stake. Aided by King's Musketeers Athos, Porthos and Aramis, he faces the machinations of villainous Cardinal Richelieu and Milady de Winter, while falling in love with Constance, the Queen's confidante.