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

That was rash , Jessica thought. This banker might have enough rank to call my son out . She saw that Idaho was poised for instant action. The House troopers were alert. Gurney Halleck had his eyes on the men opposite him.
"Ho-ho-ho-o-o-o!" It was the smuggler, Tuek, head thrown back laughing with complete abandon.
Nervous smiles appeared around the table.
Bewt was grinning.
The banker had pushed his chair back, was glaring at Paul.
Kynes said: "One baits an Atreides at his own risk."
"Is it Atreides custom to insult their guests?" the banker demanded.
Before Paul could answer, Jessica leaned forward, said: "Sir!" And she thought: We must learn this Harkonnen creature's game. Is he here to try for Paul? Does he have help?
"My son displays a general garment and you claim it's cut to your fit?" Jessica asked. "What a fascinating revelation." She slid a hand down to her leg to the crysknife she had fastened in a calf-sheath.
The banker turned his glare on Jessica. Eyes shifted away from Paul and she saw him ease himself back from the table, freeing himself for action. He had focused on the code word: garment. "Prepare for violence . "
Kynes directed a speculative look at Jessica, gave a subtle hand signal to Tuek.
The smuggler lurched to his feet, lifted his flagon. "I'll give you a toast," he said. "To young Paul Atreides, still a lad by his looks, but a man by his actions."
Why do they intrude? Jessica asked herself.
The banker stared now at Kynes, and Jessica saw terror return to the agent's face.
People began responding all around the table.
Where Kynes leads, people follow , Jessica thought. He has told us he sides with Paul. What's the secret of his power? It can't be because he's Judge of the Change. That's temporary. And certainly not because he's a civil servant .
She removed her hand from the crysknife hilt, lifted her flagon to Kynes, who responded in kind.
Only Paul and the banker—(Soo-Soo! What an idiotic nickname! Jessica thought.)—remained empty-handed. The banker's attention stayed fixed on Kynes. Paul stared at his plate.
I was handling it correctly , Paul thought. Why do they interfere? He glanced covertly at the male guests nearest him. Prepare for violence? From whom? Certainly not from that banker fellow.
Halleck stirred, spoke as though to no one in particular, directing his words over the heads of the guests across from him: "In our society, people shouldn't be quick to take offense. It's frequently suicidal." He looked at the stillsuit manufacturer's daughter beside him. "Don't you think so, miss?"
"Oh, yes. Yes. Indeed I do," She said. "There's too much violence. It makes me sick. And lots of times no offense is meant, but people die anyway. It doesn't make sense."
"Indeed it doesn't," Halleck said.
Jessica saw the near perfection of the girl's act, realized: That empty-headed little female is not an empty-headed little female . She saw then the pattern of the threat and understood that Halleck, too, had detected it. They had planned to lure Paul with sex. Jessica relaxed. Her son had probably been the first to see it—his training hadn't overlooked that obvious gambit.
Kynes spoke to the banker: "Isn't another apology in order?"
The banker turned a sickly grin toward Jessica, said: "My Lady, I fear I've overindulged in your wines. You serve potent drink at table, and I'm not accustomed to it."
Jessica heard the venom beneath his tone, spoke sweetly: "When strangers meet, great allowance should be made for differences of custom and training."
"Thank you, my Lady," he said.
The dark-haired companion of the stillsuit manufacturer leaned toward Jessica, said: "The Duke spoke of our being secure here. I do hope that doesn't mean more fighting."
She was directed to lead the conversation this way , Jessica thought.
"Likely this will prove unimportant," Jessica said. "But there's so much detail requiring the Duke's personal attention in these times. As long as enmity continues between Atreides and Harkonnen we cannot be too careful. The Duke has sworn kanly. He will leave no Harkonnen agent alive on Arrakis, of course." She glanced at the Guild Bank agent. "And the Conventions, naturally, support him in this." She shifted her attention to Kynes. "Is this not so, Dr. Kynes?"
"Indeed it is," Kynes said.
The stillsuit manufacturer pulled his companion gently back. She looked at him, said: "I do believe I'll eat something now. I'd like some of that bird dish you served earlier."
Jessica signaled a servant, turned to the banker: "And you, sir, were speaking of birds earlier and of their habits. I find so many interesting things about Arrakis. Tell me, where is the spice found? Do the hunters go deep into the desert?"
"Oh, no, my Lady," he said. "Very little's known of the deep desert. And almost nothing of the southern regions."
"There's a tale that a great Mother Lode of spice is to be found in the southern reaches," Kynes said, "but I suspect it was an imaginative invention made solely for purposes of a song. Some daring spice hunters do, on occasion, penetrate into the edge of the central belt, but that's extremely dangerous—navigation is uncertain, storms are frequent. Casualties increase dramatically the farther you operate from Shield Wall bases. It hasn't been found profitable to venture too far south. Perhaps if we had a weather satellite . . ."
Bewt looked up, spoke around a mouthful of food: "It's said the Fremen travel there, that they go anywhere and have hunted out soaks and sip-wells even in the southern latitudes."
"Soaks and sip-wells?" Jessica asked.
Kynes spoke quickly: "Wild rumors, my Lady. These are known on other planets, not on Arrakis. A soak is a place where water seeps to the surface or near enough to the surface to be found by digging according to certain signs. A sip-well is a form of soak where a person draws water through a straw . . . so it is said."