Paul of Dune - fits in between the original "Dune" and "Children of Dune" books. Brian Herbert is Frank Herbert's son and he has written a bunch of books in the Duniverse with co-author Kevin J. Anderson. I listened to this book via the Audible.com version with narrator Scott Brick. Scott Brick is one of my favorite narrators on audible and he does a terrific job with this book as always.
You can see the current 16 books in the series in chronological order here:
http://www.amazon.com/Dune-Saga-Chro.../1COADLEGRZEOC
Dune is one of the great sci-fi books of all time. Paul of Dune is a worthy addition to the Dune legacy, though obviously, no one is Frank Herbert but Frank Herbert.
This book delved more into Paul's motivations and his feelings about being "Maud Dib", the messiah of a religion, and the murderous Jihad that he used but could not control. Personally, I find the "it's bad now but it's for the benefit of the future" a real hard pill to swallow. I do not think the book ever resolves how the future turned out to be so good because of the tremendous horrors of the Jihad.
If you like the Dune series, this is a must read. If you haven't read the series, start with the first book: Dune.
Lee