Nelie escaped a miserable existence by becoming a frontline nurse in 1914. One day, she takes the identity of Rose, a young woman from a good family, who dies in front of her. She presents herself in her place at Madame de Lengwil's house, to become the reader of this wealthy woman.

The hot-headed young D'Artagnan along with three former legendary but now down on their luck Musketeers must unite and defeat a beautiful double agent and her villainous employer from seizing the French throne and engulfing Europe in war.