Princess Irulan’s epigraph frames the chapter around patterns, perfection, and death, warning that fixed certainty can become fatal. Paul-Muad’Dib then drifts through a spice-induced, dreamlike state in which past, present, and future blur. Paul anchors himself by recalling events he believes are real: Chani is in the south with their son Leto II, Alia and Jessica have gone south as well, and Paul has recovered and enshrined Duke Leto’s skull after a raid near Arrakeen.

Paul remembers an earlier incident in a sietch corridor when Chani killed a man who came to challenge Paul in single combat. Chani explains that the challenger was not worthy and that being killed by Muad’Dib’s woman would discourage others. The tactic works, and Paul recognizes the memory as true, helping Paul regain a firmer sense of reality.

Paul also recalls a conversation with Jessica, who fears the Fremen’s growing religious devotion to Paul and warns that religion joined to politics can rush blindly toward disaster. Paul argues that religion unifies his forces, but Jessica sees that Paul is deliberately cultivating his mystique. The memory shifts to Jessica’s uneasy acceptance of Chani and Leto II and to Jessica’s insistence that Paul does not fully understand Alia’s condition after Jessica changed the Water of Life while pregnant.

Paul wakes fully in a desert camp with Chani nearby. Paul remembers that he has come into the central erg to summon and ride a sandworm by his own skill, a necessary rite because Paul cannot be accepted as wholly Fremen until Paul rides a maker without assistance. Chani, acting both as lover and sayyadina witness, tries to steady Paul, and Paul asks about the southern sietches, Leto II, and Alia. Chani admits that women in the south fear Alia’s unnatural knowledge and have asked Jessica to exorcise her, leaving Paul certain that trouble will come from Alia’s strangeness.

As dawn rises, the Fremen prepare for the rite. Stilgar approaches with Paul’s green and black banner, speaks the ritual words, then privately warns Paul to keep the ride simple and not try to impress anyone. Stilgar gives Paul a thumper, and Shishakli gives Paul his own trusted maker hooks. Paul climbs the chosen dune alone, plants the thumper, reviews the method of mounting and steering a worm, and releases the latch.

The thumper begins calling through the sand. Paul watches and listens as the maker approaches from the southeast. The worm proves vastly larger than any Paul has seen or heard described, but Paul crosses its path to take position for the test, committing himself to the dangerous rite that will either strengthen Paul’s leadership or kill Paul.