In 1625, a young man named D'Artagnan leaves his Gascony village for Paris with his father's sword and a letter of introduction. Eager to join the Musketeers and follow in his late father's footsteps, he befriends an orphan named Jean but also clashes with Musketeers Porthos, Aramis, and Athos. After a skirmish with Cardinal Richelieu's soldiers, they unite to prevent a war between England and France and protect Queen Anne d'Autriche's honor. Yet, as they face challenges together, the cost of their noble mission remains uncertain.