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"That's the same thing said nicely."

"Perhaps."

She lets it go, which surprises me, and later I understand why: she already had what she came for, and had the grace not to make me watch her take it.

We find District Nine at 04:20 on day nineteen.

The concordance gives us the Precursor job code for a processor lockout — a safety hold, set when a unit must stay off-line pending clearance. Nine has two atmospheric processors. One failed in 2609 and has been verifiably dead ever since.

The other has been under a safety hold since the third year of the Border Wars.

"It's not broken." She says it carefully, the way you handle something you're afraid of dropping. "Darius. It's not broken. It's been waiting on a clearance code for six hundred and eight years and nobody alive knew how to issue one."

"We do."

We issue it from the relay at 06:11. Four minutes and eleven seconds, both of us touching the wall for all of it, standing in the blue-white light holding a six-century-old machine's hand while it decides whether to believe us.

It believes us.

Forty thousand residents of District Nine wake to breathable air for the first time in nineteen days. The surface feed lights up. Helena's voice comes down the line using language I have never heard from her. Tomas is laughing somewhere above us, and the sound of it is structurally unsound.

Claire doesn't say anything at all.

I know she's crying before I look. That's the part I'll think about later, in the dark, on the least wet bunk. Not the processor. Not the forty thousand. The fact that I turned toward her already knowing, from two meters away, her back to me, her face in her hands, no sound coming out of her at all.

My people have a word for that. Jalshagar. It is not a metaphor, and it is not romance, and nobody decides it. It arrives, and it runs one direction until it doesn't, and I have been an engineer nearly twenty years — I know exactly what it means when a system starts reporting a state you did not instruct it to enter.

I don't say the word. I set my hand on her shoulder, which is the most I have ever done, and she covers it with her own without turning around, and we stay like that while a district learns to breathe above us.

CHAPTER 7

CLAIRE

Nine changes everything, and most of what it changes is bad.

The good part lasts about thirty hours. Helena wins us three more weeks of funding and full sublevel authority. The council issues a statement. Somebody puts my face on a civic feed, badly lit, which Tomas has saved and now opens at least twice a day.

The bad part is that we've just told the entire city the ancient systems can be talked to.

"Anyone who was profiting from Nine being dark now knows we can turn it back on," I tell Darius on day twenty-one, over the concordance. "We didn't fix a processor. We published a method."

"Yes."

"You knew that when we issued the code."

"Yes."

"And you did it anyway."

"Forty thousand of them," he says, and returns to the schedule.

The concordance is paying out faster than we can log it. What it gives us that afternoon is a service route map — not the sanitized version in the schematic, but the working routes, the ones the Precursor system actually used, running below the Founders' tiers in a lattice that makes the modern maintenance layout look like a child's drawing.

We walk one. Sublevel Fifteen, under Founders' Second, a bore three meters wide with a service walk down one side and a conduit run down the other.

Two hundred meters in, I stop.

"Bring the light down."