The worms knew that someone else was in their realm. But they seemed far more agitated than an intruder could account for. Leto sensed a hatred, a roiling and instinctive reaction. He sprinted back to Thufir to save him. His friend seemed to be struggling with himself.

Sand erupted, and worms encircled him and Thufir. The creatures rose from the low dunes, their round and hollow faces questing this way and that for something.

"Leto, we have to go." Thufir grabbed the boy's sleeve. His voice was husky, ragged. "Go!"

"Thufir, they won't harm me. And I feel . . . I feel as if I could make them go away. But they are deeply disturbed. Something about . . . you?" Leto sensed something here that he didn't understand.

Simultaneously, the worms shot like battering rams toward the two young men on the dune. Thufir bolted away from Leto and lost his footing on the soft surface. Leto tried to go toward him, but the largest worm exploded up between them, scattering sand and dust. Another beast loomed on the other side of the transfixed Thufir, stretching its sinuous body into the air.

Thufir let out a shuddering, gut-wrenching scream. It didn't sound at all like the ghola friend Leto had known. It didn't even sound human.

The sandworms struck Thufir, but they did not simply devour him. As if in vindictive anger, the largest worm slammed down on him, smashing the young man's body into the sand. The next worm reared up and rolled over the already broken Thufir Hawat. For good measure, a third worm crushed the lifeless form. Then the trio of worms backed away, as if proud of what they had done.

Leto stumbled across the sand toward the smashed body, oblivious to the threat of the worms. He slid down a churned dune, and fell to his hands and knees beside the smashed, partially buried form. "Thufir!"

But he did not see the familiar face of his friend. The crushed features were pale and blank, the hair colorless, the expression inhuman. The black-b.u.t.ton eyes were unfocused and dead.

In shock, Leto reeled backward.

Thufir was a Face Dancer.Here is my mask-it looks just like yours. We cannot see what our masks look like while we are wearing them.-The Wheel of Deception, Tleilaxu commentary

Uproar in the hierarchy of the no-ship. Astonishment. Even Duncan Idaho could not grasp how such a thing could have happened. How long had the Face Dancer been watching them aboard the no-ship? The mangled, ugly corpse left no room for doubt.

Thufir Hawat had been a Face Dancer! How could it be him?

The original warrior Mentat had served House Atreides. Hawat had been Duncan's good and loyal friend-but not this faux version of him. In all this time, during the three years of sabotage and murder-and perhaps even longer-Duncan had not detected the Face Dancer in Hawat, nor had Bashar Teg who mentored him. Nor had the Bene Gesserit Sisters, nor any of the other ghola children. But how? But how?

An even worse question hung over them, blackening Duncan's thoughts like a solar eclipse: We have found one Face Dancer. Are there others? We have found one Face Dancer. Are there others?

He looked at Sheeana, at the stricken Leto II, and at the two shocked guards who stared at the alien body. "We have to keep this secret until we can account for everyone aboard the ship. We've got to watch them, find a way to test them somehow . . . ."

She agreed. "If there are any other Face Dancers aboard, we need to act before they discover what happened." In Bene Gesserit Voice, using a tone that was the equivalent of a verbal blow, she said to the guards, "Speak of this to no one."

They froze. Sheeana was already making plans to implement a crackdown and sweep of everyone on the ship. Duncan's Mentat mind raced as he tried to comprehend what could have happened, but the nagging questions defied all his attempts to impose logic.

One rose above others: How do we even know a test will work? How do we even know a test will work? Thufir had already faced interrogation by the Truthsayers, just as everyone onboard had. Somehow, these new Face Dancers could evade even the witches' truthsense. Thufir had already faced interrogation by the Truthsayers, just as everyone onboard had. Somehow, these new Face Dancers could evade even the witches' truthsense.

If the young ghola had been replaced by a Face Dancer at some point, how could such a subst.i.tution have occurred without Duncan's knowledge? And when had it occurred? Had the real Thufir accidentally encountered a hidden Face Dancer in a darkened pa.s.sageway? One of the secret survivors from the Handlers' suicide crashes in a long-term elaborate ruse? How else could a Face Dancer have gotten aboard the Ithaca Ithaca?

In a.s.suming the ident.i.ty of a victim, a Face Dancer imprinted himself with a perfect copy of the original person's personality and memories, thus creating an exact duplicate. And yet, the false Thufir had risked his life for young Leto II amongst the sandworms. Why? How much of Thufir had actually been in the Face Dancer? Had there ever been a real Thufir ghola?

At first, with the Face Dancer exposed, Duncan had felt a sense of relief that the saboteur and murderer was at last revealed. But after a swift Mentat a.n.a.lysis, he quickly put together several instances of sabotage during which the Thufir Hawat ghola had a clear alibi. Duncan had himself been with him during some of the attacks. The next projection was incontrovertible.

There is more than one Face Dancer among us.

DUNCAN AND TEG met in a small copper-walled room designed for private meetings, blocked from all known scanning devices. Subtle indications implied that this had originally been designed as an interrogation chamber. How often had the original Honored Matres used it as such? For torture, or simply amus.e.m.e.nt? met in a small copper-walled room designed for private meetings, blocked from all known scanning devices. Subtle indications implied that this had originally been designed as an interrogation chamber. How often had the original Honored Matres used it as such? For torture, or simply amus.e.m.e.nt?

Standing coolly at attention, Teg and Duncan faced the Reverend Mothers Sheeana, Garimi, and Elyen, who had consumed the last available doses of the truthtrance drug. All of the women were armed and highly suspicious. Sheeana said, "Under various pretexts, we have isolated everyone aboard, using layers of observers. Most of them think we're searching for the missing explosive mines. So far, very few people know about Thufir Hawat. Other Face Dancers would not be aware that they are at risk of exposure."

"I would have thought the entire idea absurd-until recently. Now no suspicion seems too paranoid." Duncan locked gazes with the Bashar, and both nodded.

"My truthtrance is deeper than it has been before," Elyen said, sounding distant.

"Perhaps we didn't ask the correct questions previously." Garimi put her elbows on the table.

Teg said, "Ask away, then. The sooner you clear us of suspicion, the faster we can root out this cancer. We need a different kind of test."

Normally a trained Bene Gesserit should have been able to uncover deception with a mere question or two, but this extraordinary inquiry lasted an hour. Because they were building a cadre of trustworthy allies, Sheeana and her Sisters needed to be thorough. And they needed to do a better job than before. The three Reverend Mothers watched for even the slightest flicker of evasion. Neither Duncan nor Teg gave them any.

"We believe you," Garimi finally said. "Unless you give us cause to change our minds."

Sheeana nodded. "Provisionally, we accept that you two are exactly who you say you are."

Teg seemed bitterly amused. "And Duncan and I accept you three as well. Provisionally Provisionally."

"Face Dancers are mimics. They can change their appearance, but they cannot change their DNA. Now that we have cell samples from the Hawat impostor, our Suk doctors should be able to develop an accurate test."

"So we believe," Teg said. With the loss of his protege, the Bashar seemed fundamentally disturbed. He no longer took anything at face value.

With an iron-hard scowl, Garimi said, "The obvious answer is that Hawat was born a Face Dancer, then carefully planted and manipulated by our Tleilaxu Master. Who would know Face Dancers better than old Scytale? We know he had the cells in his nullentropy tube. If that scenario is true, the deception went on for almost eighteen years."

Sheeana continued, "A Face Dancer infant could have mimicked a generic human baby from the very beginning. As he grew, he took a shape based on archival records of the young Atreides warrior-Mentat. Since no one here-not even you, Duncan-remembers the original Hawat as an adolescent, the disguise would not need to be perfect."

Duncan knew she was right. In his original lifetime, when he'd escaped from the Harkonnens and gone to Caladan, Thufir Hawat had already been a weathered battle veteran. Duncan remembered his first real conversation with Hawat. He'd been a stable boy at Castle Caladan, working with the Salusan bulls that Old Duke Paulus loved to fight in grand spectacles. Someone had drugged the bulls into a frenzy, and young Duncan had tried to raise the alarm, but no one believed him. After Paulus was gored to death, Hawat himself had led the investigation, hauling young Duncan before a board of inquiry, since evidence indicated that he was a Harkonnen spy . . . .

And now this Thufir was a Face Dancer! Duncan still had trouble wrapping his mind around the undeniable reality.

"Then all of the ghola babies could be Face Dancers," Duncan said. "I suggest you summon Scytale. He's now our prime suspect."

"Or," Teg said in a brittle voice, "he may be our best resource. As Garimi already stated, who would know the Face Dancers better?"

When the Tleilaxu Master was brought into the copper-walled chamber, Duncan and Teg took seats at the other side of the table, part of the growing inquisition to root out the Face Dancer infiltration. Scytale appeared frightened and unsettled. The Tleilaxu ghola was fifteen years old, but he did not look like a boy. His elfin features, sharp teeth, and gray skin made him seem alien and suspicious, but Duncan realized that was only a knee-jerk response based on primitive superst.i.tions and previous experiences.

After Scytale sat down, Elyen leaned forward. She looked the sternest of them all. "What have you done, Tleilaxu? What is your plan? How have you tried to betray us?" She used an edge of Voice, enough to make Scytale jerk.

"I did nothing."

"You and your genetic predecessor knew what you were growing in the axlotl tanks. We tested the cells before allowing you to create them, but you deceived us somehow with Thufir Hawat." They showed him images of the dead Face Dancer. Duncan could see that the Tleilaxu's surprise was genuine.

"Are all of the ghola children similarly tainted?" Sheeana demanded.

"None of them are," Scytale insisted. "Unless they were replaced sometime after after being decanted from the tanks." being decanted from the tanks."

Elyen narrowed her gaze. "He's telling the truth. I see none of the indicators." Sheeana and Garimi silently consulted each other and nodded simultaneously. Then Sheeana said, "Unless he is himself a Face Dancer."

"Scytale isn't likely to be a Face Dancer subst.i.tute simply because so few of us trust him anyway," Duncan pointed out. "A Face Dancer would choose to be someone who could more easily move among us."

"Someone like Thufir Hawat," Teg said.

Young Scytale looked greatly disturbed. "Those new Face Dancers were brought back from the Scattering. The Lost Tleilaxu claimed to have modified them in ways we didn't understand. Much to my dismay, I have now learned that even I can't detect one of them. Believe me, I never suspected Hawat."

"Then how did a Face Dancer get aboard, if not grown from the Face Dancer cells in your nullentropy capsule?" Sheeana asked.

"The Face Dancer could already have been posing as one of us when we left Chapterhouse," Duncan mused. "How carefully did you check all of the original hundred and fifty who rushed aboard during the escape?"

Teg shook his head. "But why wait more than two decades to strike? It makes no sense."

"A sleeper agent, perhaps," Sheeana suggested. "Or, could the Face Dancer have been someone else for a long time, and only recently replaced Thufir?"

"Yes, look for a scapegoat to persecute," Scytale said bitterly, slumping in the overlarge interrogation chair. "Preferably a Tleilaxu."

Sheeana had fire in her eyes. "As a precaution, we have sealed all of the ghola children in separate rooms, where they can cause no damage if another of them is a Face Dancer. I've already directed our Suk doctors to take blood samples. They won't escape."

Duncan wondered if her vehemence might suggest that she she was a Face Dancer. He narrowed his eyes suspiciously and continued to watch her. He would have to watch everyone he could, at all times. was a Face Dancer. He narrowed his eyes suspiciously and continued to watch her. He would have to watch everyone he could, at all times.

Garimi looked around at their small trusted cadre. "I-or another of our choosing-will remain on the navigation bridge and monitor the no-ship while every single person aboard is brought into the main meeting chamber. Herd them in, account for every one, even the children. Lock the doors and test them all. One by one. Learn the truth."

"What definitive tests can we use?" Teg asked. "On any of us?"

Scytale piped up, "I believe I can develop a reliable method. Using a tissue sample from the Hawat Face Dancer, I will prepare a comparison panel. There are certain . . . techniques I could use. He is one of the new breed brought back by the Lost Tleilaxu, and he differs from the old ones. But with this sample-"

"And why should we trust you?" Garimi said. "Your own purity hasn't yet been proven."

Scytale wore a forlorn expression. "You have to trust someone."

"Do we?"

"I would allow myself to be observed by your experts at all times during the preparations."

Duncan glanced at the Tleilaxu Master. "Scytale's suggestion is a good one."

"Or I can offer another option. When the Face Dancers betrayed my fellow Masters back on Tleilax and our other worlds, some of us had time to fight back. We created a toxin that specifically targets Face Dancers-a selective poison. If you grant me access to laboratory facilities, I can recreate that toxin and deploy it as a gas."

"To what purpose?" Teg asked. Then his expression changed to one of understanding. "Ah, to flood the Ithaca Ithaca's air systems. We would kill any Face Dancers who remain among us."

"The quant.i.ties necessary to saturate our ship would be huge," Duncan said, racing through a Mentat calculation to estimate the volume of air within the gigantic vessel, the concentration of gas that would prove lethal to the shape-shifters, the possibility of making others ill and debilitating the crew.

Garimi couldn't believe what she was hearing. "You're suggesting we let this Tleilaxu Tleilaxu release an unknown gas into our ship? They created the Face Dancers!" release an unknown gas into our ship? They created the Face Dancers!"

Scytale answered her in a voice heavy with scorn. "You witches fail to think. Don't you see that I myself face a dire threat? These are new new Face Dancers, brought in from outside by the Lost Tleilaxu-our b.a.s.t.a.r.d stepbrothers who cooperated with the Honored Matres to annihilate all the old Masters like myself. Think! If other Face Dancers are aboard the Face Dancers, brought in from outside by the Lost Tleilaxu-our b.a.s.t.a.r.d stepbrothers who cooperated with the Honored Matres to annihilate all the old Masters like myself. Think! If other Face Dancers are aboard the Ithaca Ithaca, then I am in greater personal danger than anyone else. Can't you understand that?"

"Scytale's gas must only be a last resort," Duncan said.

Sheeana looked around the room. "I'll let him begin work on the toxin, but I'd prefer that we identify any Face Dancer directly."

"And interrogate it," Garimi said.

Scytale laughed. "You think you can interrogate a Face Dancer?"

"Never underestimate the Bene Gesserit."

Sheeana nodded. "Until we root out any other infiltrators, until we prove there are no more Face Dancers among us, our only safety lies in staying in large enough groups that the shape-shifters can't attack without being seen."

"What if an overwhelming number of us are already Face Dancers?" Teg said.

"Then we're all lost."

DURING THE LOCKDOWN, each of the ghola children was tested; Leto II submitted first. When the sandworms had turned on Thufir Hawat, somehow sensing the alien Face Dancer, Leto's shock had seemed genuine. The imagers showed him staring in disbelief at the ruined body that had reverted to its blank Face Dancer state. But Thufir had clearly placed himself in danger, voluntarily going toward Leto when he did not need to. Why would a Face Dancer put himself at risk, unless the copy was so accurate that even the friendship was real?

Leto, ghola of the Tyrant, was many extraordinary things. But he was not a Face Dancer. Scytale's genetic a.n.a.lysis proved it.

Paul Atreides was also found to be clean, along with Chani, Jessica, and the three-year-old Alia, who was intrigued by the needles and samples. Despite the usual suspicions surrounding him, Wellington Yueh was also who he claimed to be.

After Scytale completed the blood and cellular tests, Sheeana was still not satisfied. "Even if we can now trust the ghola children, that means only that other Face Dancers-if there are any more-must be hidden among the rest of us."

"Then we'll test the rest," Garimi said. "Or use Scytale's poison gas. I'll personally submit to any scrutiny, again and again, and I suggest we all do so."

Scytale raised his small hands in alarm. "This test is an intensive one. I'll need to prepare enough panels for all pa.s.sengers, and that will take a great deal of time."

"Then we will take the time," Sheeana announced. "Doing anything less would be foolhardy."Why do we find destruction so fascinating? When we see a terrible tragedy, do we think ourselves clever for having evaded it ourselves? Or is our fascination rooted in the thrill and fear of knowing we could be next?-MOTHER SUPERIOR ODRADE, Doc.u.mentation of Consequences

Murbella and Janess-mother and daughter, Mother Commander and Supreme Bashar-orbited the dead world of Richese. They rode in an observation ship, separate from the teams of engineers, who were still leery about the burned-out plague on Chapterhouse. Though the disease had run its course, the Ixians refused to be in a confined s.p.a.ce with Murbella and Janess, who had been exposed to it.

Nevertheless, alone in their small ship, the two women had a perfect view of the unfolding test.

More than five years earlier, rebel Honored Matre ships from Tleilax had bombarded Richese, erasing not only the entire population, but also the weapons industries and the half-constructed battle fleet that was to have been delivered to the New Sisterhood. Now that the planet was lifeless, however, Richese was a perfectly appropriate place for the Ixians to demonstrate their new Obliterator weapons.

Murbella opened the commline and spoke to the four accompanying test ships. "You take a smug pleasure in doing this, don't you, Chief Fabricator?"

On the screen, Shayama Sen arched his eyebrows and jerked his head back in a fine display of innocence. "We're testing the weapon you ordered from us, Mother Commander. You asked for a demonstration, rather than taking us at our word. We must prove that our technology functions as advertised."

"And the rivalry between Ix and Richese had nothing to do with your choice of targets?" She barely held her sarcasm in check.

"Richese is just a historical footnote, Mother Commander. Any enjoyment Ixians might have taken from our rivals' unfortunate fate has long since faded." After a pause, Sen added, "We admit, however, that the irony does not escape us."

Since last visiting her high above Chapterhouse, the factory leader sounded subtly changed. Recently, when Sen had come back to deliver full records of all their tests on Ix, he had seemed surprised, even embarra.s.sed. He had followed her suspicious suggestion and used the cellular test on all of his people, with the result that twenty-two Face Dancers had been exposed, all of them working in critical industries.