“They died out?” asked Loaf.

“They killed each other,” said Rigg bitterly. “When they were sure they had killed the last facemask-controlled person, they killed themselves—”

“Each other,” said Vadesh.

“Collectively killed themselves,” said Rigg, “so there was no chance that their keeper here could breed them with more facemasks.”

“They didn’t understand that I would never do that,” said Vadesh. “I am incapable of harming human beings.”

“But you can let them come to harm. Goad them to it, trap them. Aid their enemies.”

“Humans must be free,” said Vadesh. “It is deeply ingrained in my programming. I cannot defy that. All choices are to be made by humans. I merely help them carry out their plans.”

Rigg could not let that stand. “You are such a liar,” he said. “I was raised by one of you, and he was certainly not carrying out anybody’s plan.”

“He wasn’t carrying out your plan, you mean,” said Vadesh.

“Nor mine,” said Umbo.

“Nor the plans of General Citizen and Hagia Sessamin,” said Olivenko. “So whose plan was he carrying out?”

“Neither of us controls the other,” said Vadesh. “But we started out with the same directives—given to us by humans. Our original programmers, and then Ram Odin. He gave us a great work to do. The expendable Ram pursued it his way in your natal wallfold, and I pursued it as best I could here in this wallfold. I made mistakes. I misunderstood the depth of the human fear of the strange and new. They could not be reasoned with.”

“Meaning you couldn’t find them all and kill them,” said Rigg.

“I killed no one,” said Vadesh.

“But you found them,” said Umbo. “And told the facemask people where they were, so they could kill them.”

“I wanted them reconciled!”

“But ‘killed’ was almost as good,” said Rigg. “They were waging a war of extermination, and you weighed in on the side of those who were only half human.”

“There are safeguards now,” said Vadesh. “I’ve worked hard. Ten thousand years I’ve been breeding facemasks until all the obnoxious traits are gone. Humans would remain fully human, in charge of themselves.”

“We are never going to put on your facemasks,” said Rigg.

“But you haven’t even seen them!”

“What we need from you,” said Rigg, “and what I order you to give us, is information about the jewels. How do they work? How can we use them to shut down the Walls?”

Vadesh looked away—a gesture Father often used, to give the illusion of thinking things over. But it was only an illusion, Rigg understood that now. The mechanical mind made its decisions very quickly, and all this business of “thinking” was part of the pretense that the expendables were similar to humans. But they were nothing like humans.

“It seems to me,” said Rigg, “that you want us to think this is all about two species—facemasks and humans. But there’s a third species involved.”

Rigg’s friends looked at him, confused.

Vadesh understood him, though. “Expendables are not a species,” he said.

“Aren’t you?”

“We are not alive. We do not reproduce.”

“No, but you replace any parts that wear out,” said Rigg. “You don’t have to reproduce if you never die.”

“We are here to support and enhance human life,” said Vadesh.

The others laughed or hooted bitterly.

“Maybe that was your original law,” said Rigg, “but you proved that enhancing human life is the opposite of what you actually have in mind.”

“The facemasks eventually did enhance human life,” said Vadesh. “That was my great insight, when I finally understood it.”

“Humans are the only fit judges of what enhances our lives,” said Olivenko.

“I see that now,” said Vadesh. “I’ve learned. Do you think I don’t understand that I failed here? All the humans preferred murder and death, do you think I regard that as success? That’s why I beg you to bring humans back here, so I can undo my terrible mistakes.”

“You have the power to bring down the Wall,” said Rigg. “You expendables put it there, didn’t you?”

“We each have the power to shut down our own protective field. But the Wall consists of two fields, pushed up against each other. I could make the Wall half as wide, but I could not bring it down.”

“Unless the other expendables agreed with you,” said Rigg. “But they didn’t, did they?”

Vadesh once again said nothing.

“Silence from you is a lie,” said Rigg.

“They would not let me import a new population,” said Vadesh.

“If the other expendables regard you as so much of a failure that you can’t be trusted with more people,” said Rigg, “why should we contradict their superior wisdom?”

“Expendables must bow to the will of humans,” said Vadesh. “You can contradict us whenever you want.”

“Millions of people must have wished they could get through the Wall,” said Loaf. “It never came down for them.”

“Wishes are not informed decisions,” said Vadesh.

Rigg chuckled. “But who can possibly inform us, except you expendables?”

“Exactly,” said Vadesh.

“So we only know what you tell us,” said Rigg. “Which means that by choosing what to tell, you can shape our decision however you want.”

“And how did Ram shape your decisions?” asked Vadesh.

Rigg and his companions were not pretending; they had to think about it.

“He sent us to the Wall,” said Umbo.

“He prepared us to come through it,” said Rigg.

“So both he and I,” said Vadesh, “wanted humans to come through the Wall.”

“No,” said Rigg. “Father wanted us to have power over the Wall—and other things. Maybe he wanted to trigger General Citizen’s revolt against the People’s Revolutionary Council. But he never did anything to suggest he wanted us to come to you.”

“I’m what’s beyond your Wall!”

“In this direction,” said Rigg. “But we saw the globe in the Tower of O. If we had gone through the Wall in a different place, we might have come to a different wallfold.”

“But you came to this one. Did Ram turn you away from here? He knew you might come, and that if you did, you’d talk to me, and he did nothing to warn you against me, did he?”

“Oh, he warned me well enough,” said Rigg. “He taught me to notice when I’m being lied to and manipulated, and to resist it.”

“Show us how to shut down the Wall,” said Loaf.

Rigg looked at him, startled. It felt like betrayal.

“I want to shut down the Wall,” said Loaf. “These Walls have kept the human race divided into little pieces. In this wallfold, the human race wiped itself out. Who knows what happened in the other seventeen? It’s time for the Walls to come down so we can inform ourselves.”

“If we bring down the Wall,” said Olivenko, “people will come here and be infected by the facemasks.”

“We warn them,” said Loaf. “Filtered water only. They’ll find a way. People always do.”

“We don’t know enough yet,” said Rigg. “We can’t just bring down the Wall when we don’t know what people will find in the other wallfolds.”

Loaf laughed at him. “You say you don’t want responsibility, but here you are appointing yourself as the guardian of the whole human race.”

“They murdered Knosso in the wallfold he crossed into,” said Olivenko.

“Murder, massacre, warfare, disease, parasites,” said Loaf. “It’s the world. We should have the freedom of it. But no, Rigg thinks he can decide everything for everybody, keep everybody safe until he decides the human race is ready. Tell me, Rigg, how are you different from these expendables? Except that you’re not as well-informed?”

“You can’t just—”

But Loaf was not disposed to listen. “I can. You’re not in charge, remember? Each of us can go off on our own, if we want.”

“I thought you said we should stay together,” said Olivenko.

“Until it no longer makes sense,” said Loaf. “The rest of you can stay with each other—I advise it. You’ll be safer. But I want to get back through the Wall. I want to go home to Leaky. But then maybe I’ll come back. This is a vast empty land. It’s not just this city, it’s the whole wallfold. Who knows what could be built here? Vadesh is a lying snake, but the more people who come, the less attention we’ll have to pay to him. He wants the Wall to come down so immigrants can come in? So do I.”