An excellent expansion/sequel to dune. Less thought provoking than the previous two in the series, but still a book that consumed my thoughts. Makes me curious for the next three in the series too! The only reason it's not a 5 for me is less use of the multiple points of view. There's a good chunk of this where it only alternates between 3-4 characters, and although its still engrossing, I'd have loved to have seen more of the other characters.