God Emperor of Dune by Frank Herbert
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Summary
More than three thousand years have passed since the first events recorded in Frank Herbert's DUNE. Only one link survives with those tumultuous times: the grotesque figure of Leto Atreides, son of the prophet Paul Muad'Dib, and now the virtually immortal God Emperor of Dune. He alone understands the future, and he knows with a terrible certainty that the evolution of his race is at an end unless he can breed new qualities into his species. But to achieve his final victory, Leto Atreides must also bring about his own downfall . . .