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For three and a half millennia, Leto II Atrid has ruled a vast space empire centred on Arrakis. During this time, both the planet and the ruler have changed beyond recognition. There is no trace of the desert Dune left - vegetation has appeared and worms have disappeared. Leto almost completely turned from a man into a sandworm. There is only one thing that remains unchanged - there is always a gkhola Duncan Aidago next to the God-Emperor. An unprecedented confrontation is brewing in the Empire. The enormous forces accumulated during the long Peace of Leto are preparing to challenge the Lord, and the most ardent enemies are in his inner circle. Duncan will have to decide whose side he's on, and the fate of all humanity will depend on his choice.