Set 3,500 years after the events of Children of Dune, this seminal sci-fi epic follows Leto Atreides II, who has transformed into a massive, nearly immortal human-sandworm hybrid to rule the universe as the God Emperor. Having enforced a forced peace known as the "Pax Leto," he controls the remaining supply of the spice melange. The novel explores themes of absolute power, sacrifice, and the heavy price of ensuring humanity's ultimate survival along the "Golden Path" while dynamic rebel forces plot his assassination.