With Gilbertus gone, Administrator Zendur was ostensibly in charge of the school. As a Mentat, the middle-aged man was swift in his calculations and talented at making projections, but he was not a leader. Though a skilled graduate of the school, Zendur was clearly out of his depth.

Since Gilbertus had charged Anna Corrino with the safekeeping of the memory core, she concealed Erasmus in her private chambers. Even though the robot could communicate with her through the implanted transceiver, she loved to hold his gelsphere in her hands and cradle it like a precious object.

“I suspect they are going to kill Headmaster Albans,” she said, in an affectless voice that carried no fear at all. Erasmus knew that Anna’s emotions were anomalous and didn’t fit the pattern of the human norm. Earlier, she had been emotional, flighty, immature, and overreactive — that was why she’d been sent to the Sisterhood school on Rossak, where her impulsive consumption of poison had damaged her brain. On the other hand, that tragedy had turned her into such a remarkable specimen.

Even with her difficulty in expressing herself, Erasmus knew the young woman was disturbed by the plight of the Mentat School and its Headmaster. “I share your concern, Anna Corrino — I have run computer projections. Gilbertus will do his best to resolve the situation, but I believe the Butlerians will exact a terrible price on him.”

“I’m worried about him.”

Erasmus considered for a long moment, running the data again and again, and kept reaching the same conclusion. “I am worried about him, too.”

No matter what Gilbertus negotiated, even after the price was paid, Erasmus didn’t trust the Butlerians to keep their agreement. “Use your training and make your own projections. I have taught you how,” he said to her. “With the Headmaster gone, what is the school’s most valuable asset?”

She answered immediately. “You are.”

“Thank you for that,” Erasmus said. “But we must assume they don’t know about me. I rephrase the question: Other than myself, what is most important?”

Anna pondered, then spoke without any pride. “I am, of course.”

“Precisely. And the Butlerians will want that asset. Therefore, we need to keep you out of their hands.”

“I agree,” she said, and then her expression fell. “If they take me hostage, how can I possibly protect you? That is really the most important thing.”

Erasmus didn’t argue with her.

Anna had spent a significant amount of time on top of the defensive walls, studying the Butlerians, counting their campfires, their numbers, their weapons. Then she wandered into obsessive numeracy, counting how many people wore red in their garments, how many wore blue, how many wore brown. She counted the number of men and the number of women, as close as she could determine, though some muffled their features with hats and scarves. She provided the data to Zendur and the Mentat students for tactical planning, though the information was not necessarily useful.

Erasmus had observed. After going out to meet with the Butlerian leader, Gilbertus had been surrounded by their guards and taken into the main headquarters tent. From a distance, using his spy-eyes from trees in the swamp, the robot watched closely. He detected anger and uneasiness in the besieging army.

He didn’t trust the unruly followers. What if Manford couldn’t control his own fanatics? An uproar could turn into a lynch mob — it had happened before. From prior analysis, Erasmus had determined that the legless leader maintained control of his followers by allowing release of their anger and tensions under certain circumstances, and when he saw them reaching critical levels, he didn’t even try to control their emotions. If the Butlerians grew too outraged, Manford might need to ignore his promise and unleash them.

A flurry occurred in the camp as a rumor rippled among the followers. Erasmus recognized Anari Idaho, Manford’s stubbornly loyal but decidedly unimaginative bodyguard, stalking through the gathered fanatics. She led Gilbertus, obviously a prisoner, to another tent at the edge of the camp, where he was placed under heavy guard.

Analyzing the facial expressions acquired from high-resolution images, Erasmus determined that the fanatics were agitated and furious. Maybe Gilbertus had refused to strike a bargain with the Butlerian leader … or maybe it was something else.

Finally, at dusk, Manford approached the front gates of the school, riding on the shoulders of his Swordmaster. After sealing his memory core in a special hiding place in her quarters, Anna went to the battlements to watch, but Erasmus stayed with her anyway, speaking into her ear.

The Butlerian leader’s voice carried through the air, and all the listeners fell silent, barely breathing. Even the swamp insects fell into a hush.

“I gave my word not to destroy the Mentat School if Headmaster Albans cooperated, and I will keep that word,” he shouted up at the gate. “I also promised the Headmaster that no harm would befall him if he met me face-to-face. Alas, that particular promise cannot be kept, now that we know the true identity of Gilbertus Albans. We know that he is nearly two centuries old, that he lived on Corrin as a collaborator with the thinking machines. We know that the demon robot Erasmus trained him and extended his life.”

The murmur of the Butlerian crowd grew louder, angrier. Behind their walls, the Mentat trainees remained silent, stunned and confused.

“His horrendous crimes long predate my promise. And punishment for a machine sympathizer who aided in the torture and murder of millions of human beings must take precedence over my agreement. That punishment is immutable. Gilbertus Albans will be executed at dawn, and then his school will be opened to us, even if we have to blast it open. All Mentat trainees will undergo careful reeducation.” Manford raised himself higher on Anari’s shoulders. “The mind of man is holy. The crimes of man must be punished.”

Anna muttered to herself, as she often did, but she was speaking to Erasmus. “They know the truth about Gilbertus. Before long, they will probably find out about you. You are in danger.”

The robot took little consolation in saying, “I doubt Gilbertus revealed that my memory core is hidden here, but somehow they did discover his past. This leads me to a difficult but necessary conclusion, Anna Corrino. You and I must escape from here — tonight.”

Chapter 73 (Is it better to make a vow to a person or to principles)

Draigo Roget arrived at Lampadas hoping to recruit Headmaster Albans, to bring him to the side of reason and civilization — only to find that the Butlerian world had gone insane.

Previously, Gilbertus had managed to keep his school isolated out in the inhospitable wastelands, but now Manford Torondo had roused his mob and laid siege to the school. Draigo was angry just to see it.

When he was a student here, Draigo had never revealed his loyalties to Venport Holdings; he kept his political opinions to himself, but he had been unable to hide his talent. Headmaster Albans had acknowledged that Draigo was the best student at the Mentat School.

In addition to mental exercises, Draigo had passed the rigorous physical challenges: sprinting through treacherous sangrove forests, memorizing the submerged stepping-stones through the marsh channels, keeping track of every safe path, every devious trick and trap. He understood that danger and physical effort helped trainees to attune their minds, that adrenaline and risk pushed them to the edge of their capabilities. Now he realized that Headmaster Albans had been preparing all along to defend the school against the Butlerians, even as he tried to remain neutral.