As a fan a Star Wars i was disappointed to say the least with the latest trilogy of films.
This book basically answers the questions of how after episode III Anakin Skywaker truly becomes Darth Vader. It deals with a lot of issues to do with vaders new life in his 'suited prison' and it also explains a great deal about Palpatines new political structure.
The best thing about this book is the authors attention to detail with the characters and their environment, something which i believe the latest trilogy lacked especially in the final episode.
For anyone who is thinking buying this book visit wookiepedia, a lot of the content on Vader post episode III comes from this book.