Part I: Chapters One through Ten

Young, ambitious d'Artagnan goes to Paris to seek his fortune, bearing a letter of introduction to Monsieur de Treville, captain of the King's Musketeers. He is impetuous and proud, and at his first stop at an inn, he gets into a fight with a nobleman who makes fun of his horse. The man's henchmen beat up d'Artagnan, but when he returns to consciousness, he sees the man talking to a beautiful woman in a carriage, calling her "Milady," before they set off. When he checks his belongings, he finds out that the man has stolen his letter of introduction.

He goes to see de Treville anyway and is impressed by the dash and swagger of all the Musketeers he sees at de Treville's headquarters. De Treville says he will help d'Artagnan but that he can't be a Musketeer before proving his worth...