In this final volume of The Three Musketeers series, Aramis plots a coup d'état to replace Louis with Philippe and recruits Porthos to assist, although Porthos is unaware of the true nature of the plot. Aramis believes that, if he puts Philippe on the throne in place of Louis, Philippe can assure Aramis's promotion to cardinal, and will eventually assist Aramis to become Pope. Aramis's further aim is to enhance Fouqet's position in France so that Fouquet will become prime minister under Philippe; Aramis plans to replace Fouquet as prime minister upon Fouquet's retirement.

Résumé
It is the last book in the &quote;d'Artagnan Romances&quote; series and is set in the reign of Louis XIV in France. The story revolves around the mysterious prisoner known as the &quote;Man in the Iron Mask&quote; and the musketeers' efforts to uncover his identity and free him from captivity. Through his masterful storytelling and vivid historical context, Dumas creates a thrilling tale of adventure, intrigue, and betrayal set against the backdrop of one of the most fascinating periods in French history. The novel explores themes of power, loyalty, and identity, while offering a richly detailed and engaging portrait of life in the court of Louis XIV. With its unforgettable characters and thrilling plot twists, &quote;The Man in the Iron Mask&quote; is a true masterpiece of historical fiction.