Years after the dramatic events that saw the secret twin of the king break free from his iron mask and challenge the throne, France enjoys a fragile peace. But beneath the surface, the old tensions have not entirely faded: the royal court is rife with intrigue, the nobles whisper in corridors, and the common people still remember the injustice of the mask. Meanwhile, the former musketeers are scattered—each carrying wounds of loyalty, regret and the passage of time. Now, a new crisis emerges when a mysterious figure claiming to be a surviving heir from a distant colony appears, stirring unrest and threatening to expose old truths long buried.

This outsider, calling himself Henri de Valois, arrives at Versailles with a striking resemblance to the late imprisoned twin. He claims the monarchy orchestrated the mask’s imposition, that many identities were erased, and demands recognition. The king, uncomfortable and paranoid, finds his power undermined not just by a challenger, but by his own guilt. The musketeers—Athos, Porthos, Aramis and d’Artagnan—are drawn back into action. Athos, ever the philosopher-warrior, hesitates to intervene; Porthos struggles with his diminished martial glories; Aramis smells opportunity; and d’Artagnan, loyal to the crown yet sympathetic to justice, must reconcile his duty with his conscience.

As Henri’s following grows among the commoners and disaffected nobles, the court factions polarize. The queen, once a quiet figure, becomes a fierce negotiator, seeking to preserve stability. The minister who once used the mask’s secret rises again, manipulating rumors and arming a private militia. Meanwhile, the musketeers uncover a shocking truth in hidden archives: the iron mask was one among several used to silence dissenters and replace inconvenient heirs. The legacy of the masked man is deeper than the twin story—it is about identity stolen, power abused and a system built on fear.

In the maelstrom of palace politics, Henri confronts the king publicly, demanding he remove the memory of the mask from state records and issue amnesty for those crushed by it. Chaos erupts: protests in the streets, sword‑fights in hidden passages, the musketeers duelling old friends who now serve the crown. Aramis’s duplicity is revealed when he betrays a brother-musketeer in exchange for promised influence. Porthos redeems himself by defending the commoners. Athos provides moral counsel. d’Artagnan leads the climactic charge into the archives beneath the palace where the minister hides incriminating documents.

The final confrontation takes place on the rooftop of Versailles at dawn. The mask returns—now symbolic rather than literal—as the king, Henri and the musketeers stand together. The minister makes a last gasp attempt to kill the king and crown Henri by force but is thwarted by the musketeers. In the end, the king issues a public declaration: the mask will be destroyed, its victims honoured, and the monarchy’s power will be tempered by a newly formed council of nobles and commoners. Henri is offered a role as advocate for the people, but he rejects the crown, choosing to travel and tell the story of the masked men.

In the aftermath, France breathes a cautious hope. The four musketeers ride out one final time together—not as soldiers of the crown only, but as guardians of justice, memory and freedom. The iron mask lies broken in the archives, a reminder of what happens when power becomes hidden and identities are suppressed. The film ends with a sunrise over the French countryside, the musketeers vanishing into mist, and a voice‑over of Henri declaring: “The mask is gone, but the truth must travel on.”