"This fourth book in the Dune series takes place 3500 years after the events of the original trilogy and tells the story of Leto, the son of Paul Atreides, savior of the planet Dune. Leto still lives but is no longer human. He has traded his humanity for virtual immortality by undergoing what will soon be a total transformation into the magnificent and enormous sandworm of Dune. He must live, for without his guidance the human race will surely go horribly astray. Will he succeed or will his awesome sacrifice have been in vain?"-from inside cover