This is the final third of the larger novel "The Vicomte de Bragelonne" which in itself is the third book in The Musketeers Trilogy. As many people seem to read this one on its own, I thought I'd add my thoughts on that. Basically, don't do it. The "man in the iron mask" subplot is a very minor one and probably not at all what you would expect based on the movies. While this is a good book if you have read the rest of the series, you will probably find it very lacking if you haven't. If you want a good stand-alone Dumas book, I would recommend the first book in this series "The Three Musketeers", the unabridged version of "The Count of Monte Cristo", or "Memoirs of a Physician".