Casa Capitular / Chapterhouse Dune

This is the most difficult of the Dune books to review. On the one hand, it's extremely slow owing to the extraordinary amount of Bene Gesserit internal monologues. On the other hand, it finally reveals the inner-workings of some of the biggest mysteries in the series. Finally, it leaves us with an incredible set of cliffhangers.

For what it is, the book is superb. Were there a proper follow up by Frank himself, I'd say this would be one of people's favorites. As a finale to the series, it sucks.