Nayla nurtured grudging admiration for Siona, but Topri, there was a man worthy of nothing except active dislike. He was a nervous fat man with bulging green eyes, a pug nose and thin lips above a dimpled chin. Topri squeaked when he spoke.

“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 on to 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 marvellous 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?”

Topri nodded automatically, but Nayla shook her head from side to side.

Siona smiled up at her. “You don’t always agree with my decisions, do you, Nayla?”

“No.” The word was forced from her.

“And you have never tried to conceal your disagreement, yet you always obey me. Why?”

“That is what I have sworn to do.”

“But I have said this is not enough.”

Nayla knew she was perspiring, knew this was revealing, but she could not move. What am I to do? I swore to God that I would obey Siona but I cannot tell her this.

“You must answer my question,” Siona said. “I command it.”

Nayla caught her breath. This was the dilemma she had most feared. There was no way out. She said a silent prayer and spoke in a low voice.

“I have sworn to God that I will obey you.”

Siona clapped her hands in glee and laughed.