King Louis demands to experience the life of his carefree subjects, but his night of fun quickly comes to an end when he and d'Artagnan are mistaken for commoners and kidnapped by the notorious criminal Lemaitre to be sold to Spain as slaves. The musketeers must find and rescue d'Artagnan and the king. Can they save Louis from mortal danger and will they return him to the palace in time for the dauphin's christening? Meanwhile Rochefort uses the king's absence to become closer to Queen Anne.