In the middle of the 17th century, the French court changed dynasties, and the young and handsome Louis XIV (Leonardo DiCaprio) succeeded to the throne, but he was a licentious and tyrannical monarch. The whole country was full of complaints and riots continued, but Louis never reflected or restrained himself. At this moment, the once glorious Three Musketeers had settled down, but Louis designed to kill Raoul, the son of Athos (John Malkovich), and occupied Raoul's fiancee, which forced Aramis (Jeremy Irons), Porthos (Gérard Depardieu), and Athos to pick up the swords that had been shelved for many years and conspire to overthrow Louis' tyranny. In the absence of their former friend, the captain of the royal guard, d’Artagnan (Gabriel Byrne), the Three Musketeers found a prisoner wearing an iron mask, Philippe (Leonardo DiCaprio), from the prison. His real identity turned out to be Louis’ twin brother! They tried to replace Louis with Philippe, an unprecedentedly risky move that affected the fate of millions of people...