To avenge her defeat and with the help of the Cardinal's army leader Rochefort, the treacherous Milady de Winter kidnaps both D'Artagnan and Constance, in order to spur a war between the French and the English, as per the Cardinal's wish.

D'Artagnan is back from England with a message for the queen. Buckingham has declared that he was ready to attack France to deliver Anne of Austria. D'Artagnan ends up arrested and thrown into prison. Musketeers wonder how to rescue their friend.