After being challenged to a duel by a younger rival, d'Artagnan, Captain of the King's Musketeers, relates the story of how, in his youth, he traveled from home to Paris with the hope of becoming a Musketeer. He immediately fell afoul of a plot by the traitorous Count Rochefort against King Louis XIV and joined forces with the celebrated 'Three Musketeers' to bring the King's enemies to justice.
