The brightest and best Musketeers of the King's Regiment are dispatched by Captain Treville to find a missing Musketeer carrying important letters on behalf of King Louis. But Cardinal Richelieu has plans to increase his political power and seeks to sabotage the good reputation of the Musketeers. Will the Cardinal triumph or can the Musketeers protect King and country?

Notorious criminal, Vadim, seeks to make life unbearable for the authorities that have imprisoned him. When he engineers a full-scale riot it falls to the Musketeers to protect those whom he seeks to destroy. Will the Musketeers discover his plan in time and stop him from endangering the monarchy? And can the inexperienced d'Artagnan prove he is worthy of becoming a Musketeer?

The Musketeers are dispatched to Le Havre to collect the infamous merchant trader Bonnaire and bring him back to Paris to be reprimanded for breaking France’s trade treaty. The mission soon descends into a treacherous battle as they must defeat Bonnaire’s surprising number of enemies. Will the Musketeers safely return or will Bonnaire’s enemies get the better of them?

Aramis helps an old friend to uncover the truth behind a disastrous mission.

Porthos returns to the dangerous streets of his youth when he’s unjustly charged with murder. In order to save him the Musketeers must prove his innocence. Their investigations uncover a tangled web of divided loyalties and greed and they risk their lives to infiltrate the unruly slums of the Court of Miracles before it is too late.