Kardinal Richelieu versucht von Juliette zu erfahren, welchen Geheimauftrag sie von der Königin erhalten hat. Doch Juliette verrät nichts. Daraufhin beschließen der Kardinal und Graf Rochefort, sie entkommen zu lassen und ihr heimlich zu folgen. Juliette trifft bald D’Artagnan, und es kommt zu einem Kampf zwischen ihm und Rochefort.
Juliette's uncle is kidnapped by the same trio who took Juliette. She, meanwhile, is being held by Rochefort's squire. She outwits him and flees, but Rochefort is already on his way to the cottage and soon discovers her escape. Rochefort and the Squire pursue Juliette, who falls into the river. Rochefort allows her to think she has got away so she will lead him to Buckingham. Juliette steals a boat and sets off for Paris, but is thwarted by a low bridge just as she meets Dogtanian and Planchet. The boat capsized, the three are drying their clothes when the boat's owner, an otter, comes by looking for it. He gives them a lift to Paris and Juliette arranges to meet Dogtanian and the Three Muskehounds at the Ile St Louis. However, the island is guarded by the Cardinal's men. On Rochefort's order the Guards do not fight, but Juliette slips away in the confusion.
Les hommes de Richelieu ne parviennent pas à faire avouer à Constance le but de sa mission, mais lorsqu’elle leur échappe, Rochefort la prend en filature, persuadé qu’elle le conduira au comte de Buckingham.
Os homens de Richeleão não conseguem persuadir Julieta a revelar em que consiste a sua missão, mas quando ela foge Rocãoforte segue-a, pois, pensa que os levará até ao duque de Buckingham. No entanto, encontra-se primeiro com Dartacão. Enquanto Dartacão e Rocãoforte travam um duelo, os Três Moscãoteiros acorrem em seu auxílio. No meio da agitação provocada pela fuga de Rocãoforte, Julieta aproveita para escapar e cumprir a sua missão.
Los hombres de Richelieu no pueden persuadir a Julieta para que revele en qué consiste su misión pero, cuando ella escapa Rochefort la sigue pensando que les conducirá hasta el Duque de Buckingham. Sin embargo, se encuentra primero con D'Artacán. Mientras D'Artacán y Rochefort están luchando, los tres mosqueperros acuden en su ayuda.
