The Man in the Iron Mask by Alexandre Dumas

Read The Man in the Iron Mask online free The Man in the Iron Mask is the third part of The Vicomte De Bragelonie, which itself is the third part of the d'Artagnan Romances by Alexandre Dumas.
Alexandre Dumas constructs the plot around the notion that the Man in the Iron Mask is the twin brother of Louis XIV, Philippe. Aramis plots a coup d’état to replace Louis with Philippe and recruits Porthos to assist.
Fouquet, the Superintendent of Finance, throws a lavish party for Louis, Colbert is jealous and so turns the king against Fouquet who has him arrested. With Fouquet languishing in prison, Aramis initiates the second half of his plan and kidnaps Louis XIV, imprisoning him in the Bastille taking Philippe's place, and then convinces Baisemeaux to replace the king with Philippe.

Aramis conspiratorially informs Fouquet of his acts but angers Fouquet who attempts to rescue Louis. Aramis and Porthos flee for Belle Isle to escape the king's impending wrath. Louis returns, exposes Philippe, and regains the throne with d'Artagnan's help, ending Philippe's brief reign. Louis banishes Philippe, ordering that "he will cover his face with an iron visor" which he "cannot raise without peril of his life."
Athos and Raoul meet Aramis and Porthos who relate their predicament before receiving horses to aid their journey to Belle Isle. But they are followed by the Duc de Beaufort, on his way to Algiers for an expedition against the Barbary corsairs. Raoul, devastated by the king's love affair with Louise, volunteers to join the Duc in his expedition. (Summary by Wikipedia)