After witnessing his parents' deaths as a child, D'Artagnan vows to avenge them by joining the King's elite guard, the Royal Musketeers. But when he reaches Paris, he finds the entire legion stripped of its commission, and their captain falsely accused of murder. With their motto in his heart, all for one and one for all, D'Artagnan reunites the Musketeers, ready to defend true justice.