"Look here, Nayla! Look what Siona has found pressed between the pages of these two books."

Nayla closed and locked the room's single door.

"You talk too much, Topri," Nayla said. "You're a blurter. How could you know if I was alone in the passage?"

Topri paled. An angry scowl settled onto his face.

"I'm afraid she's right," Siona said. "What made you think I wanted Nayla to know about my discovery?"

"You trust her with everything!"

Siona turned her attention to Nayla. "Do you know why I trust you, Nayla?" The question was asked in a flat, unemotional voice.

Nayla put down a sudden surge of fear. Had Siona discovered her secret?

Have I failed my Lord?

"Have you no response to my question?" Siona asked.

"Have I ever given you cause to do otherwise?" Nayla asked.

"That's not a sufficient cause for trust," Siona said. "There's no such thing as perfection-not in human or machine."

"Then why do you trust me?"

"Your words and your actions always agree. It's a marvelous quality. For instance, you don't like Topri and you never try to conceal your dislike."

Nayla glanced at Topri, who cleared his throat.

"I don't trust him," Nayla said.

The words popped into her mind and out of her mouth without reflection. Only after she had spoken did Nayla realize the true core of her dislike: Topri would betray anyone for personal gain.

Has he found me out?

Still scowling, Topri said, "I am not going to stand here and accept your abuse." He started to leave but Siona held up a restraining hand. Topri hesitated.

"Although we speak the old Fremen words and swear our loyalty to each other, that is not what holds us together," Siona said. "Everything is based on performance. That is all I measure. Do you understand, both of you?"