Alexandre Dumas 
The Man in the Iron Mask 

The Vicomte of Bragelonne: Ten Years Later (Le Vicomte de Bragelonne ou Dix ans plus tard) is a novel by Alexandre Dumas, père. It is the third and last of the d’Artagnan Romances following The Three Musketeers and Twenty Years After. It appeared first in serial form between 1847 and 1850.
The Man in the Iron Mask is the fourth and final volume.

About the author

Alexandre Dumas, also known as Alexandre Dumas père (where père is French for ‘father’, to distinguish him from his son Alexandre Dumas fils), was a French writer. His works have been translated into many languages and he is one of the most widely read French authors. Many of his historical novels of high adventure were originally published as serials, including The Count of Monte Cristo, The Three Musketeers, Twenty Years After and The Vicomte of Bragelonne: Ten Years Later. His novels have been adapted since the early twentieth century into nearly 200 films.