From "Manual of Muad'Dib" by the Princess Irulan

Kwisatz Haderach , Jessica thought. Did our Missionaria Protectiva plant that legend here, too? The thought fanned her secret hope for Paul. He could be the Kwisatz Haderach. He could be .
The Guild Bank representative had fallen into conversation with the water-shipper, and Bewt's voice lifted above the renewed hum of conversations: "Many people have sought to change Arrakis."
The Duke saw how the words seemed to pierce Kynes, jerking the planetologist upright and away from the flirting woman.
Into the sudden silence, a house trooper in uniform of a footman cleared his throat behind Leto, said: "Dinner is served, my Lord."
The Duke directed a questioning glance down at Jessica.
"The custom here is for host and hostess to follow their guests to table," She said, and smiled; "Shall we change that one, too, my Lord?"
He spoke coldly: "That seems a goodly custom. We shall let it stand for now."
The illusion that I suspect her of treachery must be maintained , he thought. He glanced at the guests filing past them. Who among you believes this lie?
Jessica, sensing his remoteness, wondered at it as she had done frequently the past week. He acts like a man struggling with himself, she thought. Is it because I moved so swiftly setting up this dinner party? Yet, he knows how important it is that we begin to mix our officers and men with the locals on a social plane. We are father and mother surrogate to them all. Nothing impresses that fact more firmly than this sort of social sharing .
Leto, watching the guests file past, recalled what Thufir Hawat had said when informed of the affair: "Sire! I forbid it! "
A grim smile touched the Duke's mouth. What a scene that had been. And when the Duke had remained adamant about attending the dinner, Hawat had shaken his head. "I have bad feelings about this, my Lord," he'd said. "Things move too swiftly on Arrakis. That's not like the Harkonnens. Not like them at all."
Paul passed his father escorting a young woman half a head taller than himself. He shot a sour glance at his father, nodded at something the young woman said.
"Her father manufactures stillsuits," Jessica said. "I'm told that only a fool would be caught in the deep desert wearing one of the man's suits."
"Who's the man with the scarred face ahead of Paul?" the Duke asked. "I don't place him."
"A late addition to the list," she whispered. "Gurney arranged the invitation. Smuggler."
"Gurney arranged?"
"At my request. It was cleared with Hawat, although I thought Hawat was a little stiff about it. The smuggler's called Tuek, Esmar Tuek. He's a power among his kind. They all know him here. He's dined at many of the houses."
"Why is he here?"
"Everyone here will ask that question," she said. "Tuek will sow doubt and suspicion just by his presence. He'll also serve notice that you're prepared to back up your orders against graft—by enforcement from the smugglers' end as well. This was the point Hawat appeared to like."
"I'm not sure I like it." He nodded to a passing couple, saw only a few of their guests remained to precede them. "Why didn't you invite some Fremen?"
"There's Kynes," she said.
"Yes, there's Kynes," he said. "Have you arranged any other little surprises for me?" He led her into step behind the procession.
"All else is most conventional," she said.
And she thought: My darling, can't you see that this smuggler controls fast ships, that he can be bribed? We must have a way out, a door of escape from Arrakis if all else fails us here .
As they emerged into the dining hall, she disengaged her arm, allowed Leto to seat her. He strode to his end of the table. A footman held his chair for him. The others settled with a swishing of fabrics, a scraping of chairs, but the Duke remained standing. He gave a hand signal, and the house troopers in footman uniform around the table stepped back, standing at attention.
Uneasy silence settled over the room.
Jessica, looking down the length of the table, saw a faint trembling at the corners of Leto's mouth, noted the dark flush of anger on his cheeks. What has angered him? she asked herself. Surely not my invitation to the smuggler .
"Some question my changing of the laving basin custom," Leto said. "This is my way of telling you that many things will change."
Embarrassed silence settled over the table.