一天，一位新的女侍從阿比蓋爾（艾瑪史東 飾）來到了她們的生活之中，她的靈巧聰穎成功吸引莎拉夫人並將她納入麾下；然而，她不知道的是，阿比蓋爾早已將這個得來不易的機會，視為自己登上貴族之路的重要踏板。當莎拉夫人對宮廷內明爭暗鬥的權利鬥爭感到厭倦無比時，阿比蓋爾也順理成章的替補上女王身邊的空缺。她們超出友誼且快速萌芽發展的情誼，給了她一個滿足自己野心的機會。她告訴自己，她絕不會讓任何女人、男人、政客以及所有無關緊要的事物成為她的絆腳石。

The young D'Artagnan arrives in Paris with dreams of becoming a King's musketeer. He meets and quarrels with three men, Athos, Porthos, and Aramis, each of whom challenges him to a duel. D'Artagnan finds out they are musketeers and is invited to join them in their efforts to oppose Cardinal Richelieu, who wishes to increase his already considerable power over the King. D'Artagnan must also juggle affairs with the charming Constance Bonancieux and the passionate Lady De Winter, a secret agent for the Cardinal.