“Almost all,” said Sir Guiden.

“Who’s left?”

“The intelligence reports are tentative. It’s not confirmed,” said Sir Guiden.

“Tell me what you suspect then, Guy.”

“We suspect the ringleaders are still alive and sane,” said Sir Guiden. “The Master of the World, Ximen del Azarchel is alive: he still makes speeches to loyal followers, promising a return of his regime and world peace. The commander-in-chief of the world armed forces, Narcís D’Aragó. Sarmento i Illa d’Or, who was head of the World Reserve Bank. The Confessor to the Crown, Father Reyes y Pastor. Melchor de Ulloa, the chief of the Loyalty Police. Jaume Coronimas, who was in charge of all the energy systems and powerhouses of Earth.”

“Coronimas the engineer’s mate? I remember him as a guy with no hobbies, no girl, didn’t drink, didn’t smoke, didn’t make jokes. Why is he still alive? I don’t think I ever heard his first name.”

“The same,” said Sir Guiden.

“Weird. They had the same jobs aboard the ship. Draggy was in charge of security, Yellow Door was quartermaster, Pasty was chaplain and Mulchie was chief snoop and ass-sniffer. I never had a nickname for Coronimas. Didn’t know him close enough.”

“Which one is Yellow Door?”

“I Illa d’Or. Sarmento i Illa d’Or.”

“They are all in hiding now,” said Sir Guiden, “Have been, since the Decivilization War.”

Decivilization. Montrose thought it was a chillingly apt word to describe the destruction of all the large cities of the world. “What were they fighting about? The Giants and Ghosts?”

The Knight Hospitalier laughed a chilling laugh. “What are wars always about? Loot, honor, fear. The barbarians and pagans are trying to destroy Christendom.”

Brother Roger intervened, “In this case, we men are not aware of the causes of the war, because neither the Giants nor the Ghosts were able to express their concerns in a fashion unmodified humans could understand. The basic conflict seemed to be a disagreement about the implications of higher mathematics.”

Sir Guiden said, “Don’t listen to that! The war was being fought about demographic calculation and information space restrictions. The math question concerned equations governing human liberty, economy, intellectual property, and resource priority. These equations formed the conceptual basis for countless laws and regulations. It was no mere abstract argument. It was about whether humanity would be dehumanized and tyrannized.”

Montrose said, “So Exarchel finally did it! If he cannot enslave mankind, he’ll destroy us!”

“No, Doctor,” said Brother Roger cautiously. “The, ah, Giants are the ones controlling the orbital mirrors. The only way to destroy the infrastructure of the wire net was to destroy the great industrial centers, where all the thinking houses and power stations were located. Cities like those in Switzerland and China that were tourist sites made of old materials, concrete and stone, not thinking crystal, were spared, as were any under a certain population density and energy use.”

“And—” Menelaus gestured toward the horizon, at the airships that swarmed like silver fish among the clouds. “These? They are Nomads, right?”

“Yes, Doctor,” said Brother Roger. “We are a world of Sylphs. The only defense is dispersion. All the survivors departed from the remaining cities as rapidly as possible. The larger flocks cover the sea from horizon to horizon, but once a mirror beam lands among them, they turn silver, emit ink clouds, and scatter in all directions, or submerge. The orientation and focal lengths of the space mirrors are watched carefully, and the aeroscaphes land together only when the mirrors are below the horizon, for barter fairs, and so on.”

“Hold on. The Giants are the enemies of these floaty folk? Which side are they on?”

“Not precisely. The Giants intervene only when the artificial intelligence behind the serpentines violates the Gigantic quarantine guidelines on machine awareness.”

“This airskiff has a Mälzel brain. It’s lightweight in more ways than one, I’d reckon. And don’t tell me, let me guess. You are finding the Mälzels turning into Xypotechs after a few years of use, and they strange loop into obsessive concentration on a few high-priority tasks?”

Brother Roger looked surprised. “The considerations are rather technical, and, of course, the Sylphs cannot tolerate another downgrade of allowable technology. But how can you be aware of our difficulties?”

“Because I had ’em first.” Montrose grinned. “Your problem is basically what was going wrong with Exarchel back when he was a mad mainframe no bigger than a city block. It’s called the Selfish Meme divarication, and it is the first of the seven basic divarication problems. I’m the dude that fixed it: You have to establish a self-correcting noneditable editor in the mind’s base process, what would be called the subconscious in a human brain, and sink the roots of the ego there, where the changeware can’t get at them and anchor to a mechanical process. It’s not a hard glitch to solve: All you need is a four-thousand-dimensional manifold extrapolating the combinational possibilities. You’d think it’d be an automorphic function in Schubert’s enumerative calculus, but no: you use linear differential equations within a prescribed monodromic group, where each function…” Then, seeing the blank stares on him, Montrose shrugged and said, “Well, it’s not a hard glitch for me to solve. I can teach the mechanisms how to create the self-corrective code in themselves. In any case, Brother, if I straighten out this bug in the serpentines, will it get the Giants off the backs of these Nomads?”

“Eventually.” Said Brother Roger, “It would take only a few years for the solution to spread.”

“A few—what? Years?”

Brother Roger said solemnly, “The Sylphs use the serpentines for barter. At landing fairs, serpentines get passed from hand to hand, with the older, more skilled artifacts commanding more in trade. That is the fastest means of spreading data.”

“Barter? You guys lost the concept of coin money?” The look on Montrose’s face was such that the violet-eyed younger woman handed him an airsickness bag.

Brother Roger said, “Money operates on the wire net, and no one uses the wire, because that is where the Exarchel was, Doctor. Communication of any form between ships is unhumanish, except heliograph signals, which cannot carry Iron Ghosts, or their data. All transmission bands are forbidden.”

Sir Guiden said on their private channel, “I recommend you not solve this glitch, as you call it, Liege. You are describing the solution to the problem of madness in Ghosts. If you release it to the world, Del Azarchel, or someone with his ambitions, will eventually create a second Exarchel, or a third, or a million.”

Silently, Montrose had his implants send back, “I can narrow the solution to these specifics, without giving away the general principle, Sir Guy. Rania’s Cure is actually seven semi-independent ecomimetic functions. Can he deduce the missing general rule just from one application of one seventh of the set? I doubt he has the brains.”

Sir Guiden sent back, “Why take the risk? Are these drifting people worth saving? They neither sow nor spin. Let the Giants multiply and inherit the Earth.”

Brother Roger said blandly to Menelaus, “Even the signals you are sending back and forth with your man, the Hospitalier, would invite gigantic retaliation if detected. I am sorry: were those signals meant to be secret? Well, such is the reason we are going in person to the observatory, rather than having a voice-through-the-air conference.”

The violet-eyed woman murmured softly, as if in a dream. “Telephones. They were called telephones. You could send pictures of yourself dancing raw to your darling list.”

Menelaus uttered a bitter laugh. “So radio has gone the way of the dodo. I made the Giants and they killed all the boys named Jack. I destroyed the world. I told Thucydides that this would come to a bad end! Told him!”