Cardinal Richelieu is desirous of embarrassing his king and D'Artagnan for political purposes. Employs Milady de Winter to help his cause. D'Artagnan, however, is faithful to his queen and sweetheart, Constance, the latter in her services as spy. Milady is captured but a traitor aids her to escape. However, she has her revenge by poisoning Constance and in turn is beheaded.