On the road to Paris to join the King's musketeers, D'Artagnan of Gascony is insulted by fellow musketeers Aramis, Athos and Porthos. In response, D'Artagnan slanders the three musketeers and arranges for a duel at the Coq D'Or tavern. While awaiting D'Artagnan, the musketeers engage in a drinking match with three lackeys, who drink them under the table and then deck themselves in the musketeers' uniforms. Arriving at the tavern, D'Artagnan mistakes the lackeys for the musketeers, and before they can protest, the four are attacked by Cardinal Richelieu's guardsmen and join forces to defeat their attackers. That night, D'Artagnan takes a room at the inn and meets Lady Constance, who has accompanied the Queen to a lover's rendezvous with France's enemy, Lord Buckingham. As a token of love, the Queen presents an emerald brooch to Buckingham, an act observed by the innkeeper, Naveau, who reports to Richelieu. To prove the Queen's disloyalty, the cardinal plots to seize possession of the brooch and sends Milady De Winter and De Rochefort to steal the brooch from Buckingham. Upon discovering Richelieu's treachery, Constance pleads with D'Artagnan to recover the brooch, and he sets out with his three companions to the port of Calais, the gateway to England. There, he meets Milady De Winter, who, informed of D'Artagnan's mission, takes him captive. On the road back to Paris, however, Milady De Winter's coach breaks down at an inn, and the three lackeys are able to rescue D'Artagnan and the brooch. Learning that Constance is being held prisoner at the cardinal's country estate, D'Artagnan is about to leave to rescue his sweetheart when Milady De Winter arrives and denounces the foursome. Once again, the four escape with Constance and the brooch, hotly pursued by the cardinal's guards. Meanwhile, the Queen, who has been commanded to appear at a royal ball wearing her brooch, is about to make her entrance when Constance slips her the brooch, thus thwarting the Cardinal's plot.
