Under the reign of Louis XIII, the young Charles d’Artagnan leaves his home village in Gascony and sets out for Paris, determined to fulfil his ambition to become one of the king’s musketeers. Lodgings are hard to come by in the capital but he takes a room in the house of the tight-fisted Monsieur Bonacieux, having taken a liking to his attractive niece, Constance. D’Artagnan’s eagerness to prove himself causes him to cross swords with three of the king’s best swordsmen, Athos, Porthos and Aramis. When these four are attacked by Cardinal Richelieu’s men, they join forces and become instant friends. The king overlooks this embarrassing skirmish and rewards his loyal musketeers with money, which D’Artagnan uses to hire a valet, Planchet. Meanwhile, Cardinal Richelieu has devised a Machiavellian plot to discredit the queen consort, Anne of Austria. He engages the villainous Milady de Winter to steal the queen’s diamond jewellery, so that he can then give substance to the rumour that her majesty has been unfaithful to the king. When they learn of this vile scheme, D’Artagnan and his three musketeer friends race to England in a desperate bid to recover the stolen jewels and save the reputation of their queen...