I have seen the movie, and I absolutely loved the film, and all the characters, especially, the young guy, and all three musketeers. Though the movie is little different from the book, that I found was a good idea. Coz, the book itself was complete and I don't think there was any scope for the sequel. And the movie, Yes, a sequel is required to be made.
Talking about the book here, this book, set in France, Where the young guy saves the French Kingdom with Three Musketeers, and how this all political drama happens there. Though there are more deaths of important characters in the book as compare to film, which I didn't liked. It was a short read, as it was an illustrated edition, so this book is not large, as compare to some other editions which are 700+ pages, and that's really huge. I don't have any plans to read that huge book currently, as I know the story now, so it would be just whatever. anyway, if years later, if I want to read that book again, then for sure, I'll go for that 700+ pages book.