Der machthungrige Kardinal Richelieu möchte D’Artagnan nun endgültig aus dem Weg räumen. Seine drei Verbündeten Widimer, Rochefort und Mylady de Winter wollen auf verschiedene Weise mithelfen. Schließlich wendet sich alles doch noch zum Guten: D’Artagnan wird durch die ehrliche Fürsprache des Grafen Rochefort zum „Musketier des Königs“ ernannt.
Dogtanian and his friends arrive back in France. Richelieu has decided to get rid of Dogtanian once and for all. Though Rochefort protests, the Cardinal gives Widimer poison and instructs him to give it to Dogtanian in a bottle of wine. Rochefort sends a message warning of the danger and challenging Dogtanian to a duel. When Widimer arrives, Dogtanian pretends to be unaware of the trick and insists that Widimer drink a toast with him. The terrified Captain admits it's poison and leaves in disgrace. After contemplating suicide, he decides to abandon the service of the Cardinal and be a free man. Dogtanian arrives for his fight with Rochefort, while the Musketeers, told of the duel by Planchet and Juliette, try to stop it. Rochefort is shot by Milady, who was aiming for Dogtanian. His code of honour broken, he vows never to pick up a sword again. The Muskehounds chase Milady but let her go as being of no importance. When they arrive home there is a message: Dogtanian must go to the
De retour en France, Richelieu souhaite désespérément mettre D’Artagnan hors circuit. Chacun de ses trois complices a sa petite idée de comment se débarrasser de lui. Ne sera-t-il donc jamais mousquetaire ?
Os três aliados de Richeleão têm planos para afastar Dartacão do seu caminho: Widimer tenta envenená-lo; Rocãoforte desafia-o para um duelo; Milady dispara contra ele, mas falha e atinge Rocãoforte. Na audiência real para decidir se Dartacão deve ser um Moscãoteiro, o rei pede a opinião a todos os presentes. Richeleão cede o seu voto a Rocãoforte, que vota a favor. O sonho de Dartacão torna-se realidade.
