The aging comrades D'Artagnan, Athos, Porthos, and Aramis are drawn back from retirement into the intrigues of the young king’s court, where a powerful minister's rivalry with royal administrators threatens wealth and influence. D'Artagnan is sent to investigate suspicious fortifications and uncovers surprising links involving Porthos and Aramis, while Colbert's maneuvers against Fouquet set political traps. As loyalties conflict and erased documents and hidden designs surface, the friends' honor and ambitions are tested amid a web of vengeance, ambition, and shifting royal favor.