Ready to help the queen regain the diamond tags, whatever the cost, Constance Bonacieux pleads with d'Artagnan to undertake the dangerous trip to London in order to retrieve the diamond tags from the duke before the ball and thereby save the queen's reputation. D'Artagnan readily accepts Constance's request, and accompanied by the three musketeers, he begins the hazardous trip to London. On the way, they are continually ambushed by the cardinal's spies, and one by one, the musketeers are foiled from accompanying d'Artagnan to London.