At breakfast in the conference room, Duke Leto stands beside a portable poison snooper while Paul studies a filmclip about Fremen religious practices. Paul is unsettled by the Fremen titles applied to him, including Mahdi and Lisan al-Gaib, because they echo the Bene Gesserit idea of the Kwisatz Haderach and intensify his sense of a strange, familiar purpose on Arrakis.

Leto tells Paul that he must do something hateful: he will appear to believe the Harkonnen note suggesting Lady Jessica may betray him. Leto explains that he does not doubt Jessica at all, but the deception must look real so the enemy thinks the trick has succeeded. Jessica herself cannot know the truth, because her hurt and response must be genuine if Leto is to draw out the real traitor.

Leto reveals another reason for telling Paul: if something happens to Leto, Paul must tell Jessica that Leto never mistrusted her. Paul recognizes the fatalism in Leto’s words and tries to deny the danger, but Leto silences him. Leto then admits to deep moral exhaustion and reflects bitterly on the compromises of ruling, including remaining unmarried to Jessica so other Houses still hope for alliance through marriage.

The conversation broadens into Leto’s view of political power. Leto says his House must project bravura and use propaganda, even manufacturing filmbase from spice residue so it can spread information about his rule. He sees both opportunity and danger on Arrakis: spice exposure and strict food-water controls limit poisoning, but holding the planet demands harsh choices that may corrupt the Atreides banner.

Leto contrasts Caladan’s sea and air power with Arrakis’s need for desert power. If Leto dies, Paul will not inherit a stable renegade House but a hunted guerrilla House, so Leto intends to increase Paul’s guerrilla training. As a last resort, Leto suggests Paul may have to exploit the Fremen belief that he is Mahdi or Lisan al-Gaib, then wonders why the ecologist has not yet arrived.