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"You knew about the retainers," he says. "You must have known. Nine years I looked at that socket."

"I didn't know. I recognized a bracket." My voice stays level, because he does not deserve it raised. "That is what separates us, Mr. Marr. You spent forty years learning what this city is worth. I spent nineteen learning what it is made of."

"And that's supposed to be the lesson."

"There is no lesson. There is a hearing." I crouch so we are level, the way Claire does. "You will be charged. You will be represented. You will be permitted to make your argument in a chamber, and I intend to sit through every hour of it. That is what you are owed and it is all you are owed."

He looks past me at the socket, at four legs of his own platform holding a machine older than writing inside its own edges.

"It was a decent argument," he says.

"It was. It was also wrong, and I will explain why afterward if you care to hear it, and I suspect you will not."

Behind me the light below the walkway steadies, stops flickering, and comes up.

CHAPTER 37

CLAIRE

The restoration takes eleven hours, and nothing in this entire account is less dramatic.

That's what nobody upstairs will ever believe. There's no moment. There's a queue. The Custodian comes back inside its boundary and immediately begins doing what it has done for ninety centuries, which is process work orders in the order they arrive, and Darius and I sit propped against a rail and countersign for eleven hours while a city stops dying around us.

The northern atmospheric return comes back at 23:40. Hub One and Hub Two, still held above us by people who have not yet heard that anything happened, brought back into the network at 01:15 without a single crew going near them. The Lung's exhaust comes back into balance at 02:30. Water in the Exchange. Water in Founders' First, Second, Third and Fourth.

By 08:00 on day sixty-three, atmospheric index clears emergency threshold in all nineteen districts, which last occurred before the armistice.

Not since the attacks. Since the armistice. Better than six centuries.

Somewhere in the fourth hour, with my handwriting going to pieces, I put to it something I have carried since the observation gallery.

"Custodian. What is Jalshagar?"

A pause. Then: I DO NOT HOLD THE ALZOHN WORD. I HOLD THE MEASUREMENT.

"Explain the measurement."

TWO MINDS WORKING ONE PROBLEM PRODUCE A DETECTABLE PATTERN. WHEN THE APPROACHES ARE COMPLEMENTARY AND THE PAIR PERSISTS, THE PATTERN STABILIZES AND BECOMES PREDICTIVE. EACH BEGINS ANTICIPATING THE OTHER'S NEXT STEP BECAUSE THE OTHER HAS BECOME THE MOST RELIABLE INSTRUMENT AVAILABLE.

I SENSE THIS. IT IS WHAT MY GATES ARE READING. I DO NOT CONFER THIS BOND. I DETECT A CONDITION.

Darius has stopped moving entirely.

"Say the rest," he says.

THE RELAY DID NOT CREATE ANYTHING ON DAY TWELVE. IT MEASURED TWO PEOPLE WHO HAD ALREADY BEGUN. THE CONDITION HAD BEEN FORMING SINCE YOU BOTH ARGUED ABOUT A DAMAGED READER ON SUBLEVEL TWELVE.

"So it isn't fate."

IT IS THE OPPOSITE OF FATE. IT IS ACCUMULATION.

I put my head back against the rail.

Nine weeks of half-believing that a machine under a dying city pointed at two people and made them fit. Darius up to his wrists in coolant before dawn, telling me the sums don't work, and me warning him off it, while the real fear went unnamed by both of us, which was that if the machine had made it then the machine could unmake it.

"Then what happened to Marr's pair?" I ask. "They were complementary. They passed six examinations."

THEY WERE ASSEMBLED IN JANUARY AND PAID BY THE WEEK. THE CONDITION REQUIRES PERSISTENCE UNDER LOAD. THEY HAD COMPETENCE AND NO HISTORY.