Young D'Artagnan has only one ambition, to be a King's Musketeer some day. With this dream he arrives in Paris. Monsieur de Treville, however, makes him a member of the King's Guards, and promises that if he proves his worth he can become a Musketeer one day.
Meanwhile D'Artagnan befriends Athos, Porthos and Aramis, three Musketeers, and also falls in love with the beautiful Constance Bonacieux. She is Queen Anne of France's linen maid.
Queen Anne of France presents her diamond studs to the Duke of Buckingham, her secret lover. The King, Louise XIII, suddenly announces a ball where he wants the Queen to wear his gift, the diamonds studs. Madame Constance then seeks D'Artagnan's help in getting the diamonds back to the Queen.
With the wicked Cardinal and his men chasing him, will D'Artagnan be able to save the Queen's honour? Will he fulfill his dream of becoming a Musketeer?