Dune Messiah

The conspiracy against Paul Muad'Dib — assembled by the Bene Gesserit, the Spacing Guild, and the Bene Tleilax — comes apart from the inside. The Tleilaxu had given Paul a ghola of his dead friend Duncan Idaho, resurrected and renamed Hayt, hoping the revived body could be triggered to kill the Emperor once his original memories and loyalties resurfaced. The conspirators also plant a conditioned dwarf, Bijaz, in Paul's household to help spring that trigger. When the moment comes, Hayt's true identity as Duncan Idaho reasserts itself, overriding the Tleilaxu conditioning, and he refuses to strike Paul down, instead reclaiming his old loyalty to House Atreides. Scytale, the Face Dancer at the center of the plot, is killed in a final confrontation with Paul, closing off the conspiracy's last active threat.

Before that resolution, the conspirators strike Paul with a stone burner, a weapon that blinds him even as he survives the blast. Rather than stepping back from rule, Paul continues to govern and move through the world by relying entirely on his prescient sight, effectively "seeing" the future path in front of him well enough to function despite having no physical eyesight. Around the same time, his beloved Chani, who has struggled for years with suppressed fertility, becomes pregnant and carries the pregnancy through with the aid of heavy spice use. She gives birth to twins, Leto II and Ghanima, but the strain of the birth and her spice-saturated body kill her shortly afterward, leaving Paul to grieve his one great love even as his line is secured.

Blind, widowed, and aware that Fremen law dictates the blind be given over to the desert to die, Paul chooses to honor that law rather than cling to power as a broken figurehead. He hands the throne into regency, entrusting his infant twins to his sister Alia, with the restored Duncan Idaho standing beside her as consort and protector of the succession. Princess Irulan, his political wife who had been entangled with the conspiracy's Bene Gesserit sponsors, turns fully toward the Atreides cause in the aftermath and commits herself to helping raise and protect the twins.

In the novel's final scene, Paul walks out of the sietch and into the open desert alone, following the old Fremen custom, and disappears from the story — whether to die in the wastes or to survive by some means only his prescience could arrange is left deliberately unresolved. The book closes with the newborn twins already showing unsettling signs of awareness, suggesting that, like their aunt Alia, they were affected by the spice in the womb and are far from ordinary infants — a final unsettling note as the Atreides dynasty passes, blind and orphaned, into their tiny hands.