The Last Assay

"A currency is never a thing. It is a promise about the future, made by people who will not live in it." — from the Ledger Homilies of the First Hierate

Mother Enneth Ordoval had eleven years left in her, and Ral Sayen Duhr had come to take nine of them.

The palanquin set down in the market square of Tessik at the hour when the salt gives back its heat, and the town came out to watch, because a town with nothing left to sell will still gather to see a debt collected. They kept their distance from the Hierate's bearers. They kept their children behind them.

Duhr noted the arithmetic in that. Half these people had sold the memory of their own childhoods before they were thirty — sold them for well-shares, for antibiotics, for a season of grain — and still the instinct to put a body between a stranger and a child had survived the transaction, intact and unexplained.

They have sold the reason and kept the act, she thought. That is what devotion is. That is all it has ever been.

The old woman waited on the steps of a house that had been grand when Sabaea still had rivers. Ordoval stone: blue-black, quarried offworld, hauled nine hundred kilometres across the pan by an ancestor who wanted his descendants envied. His descendants were being audited.

"Reckoner." Enneth did not rise. "You are younger than they told me."

"The Third Assay is a young office, Mother."

"It is a hungry one."

"It is an accurate one." Duhr climbed the steps and set her case on the topmost. Inside, in fitted felt, lay the assay-stone: a disc of vesh-coral the colour of a bruise, grown eleven years in the vaults at Kir Sabaea and trained on nothing but ledgers. "Your house owes the Hierate nine years of recallable depth. Chapter and seal are in the case, if you care to read them."

"I know what my house owes." Enneth drew her collar down and exposed the thread — the pale filament every Sabaean child receives in its first month, rooted at the base of the skull, branching through a life as memory settles along it like frost along wire. Hers was silver-white and very fine. Eighty-two years of it. "I want to know whether you know what you are."

"I am a Reckoner of the Third Assay."

"You are a mouth," the old woman said. "You are the last few centimetres of a very long throat."

Duhr had heard variations. Ruin makes theologians of everyone. She knelt and opened the cradle. "The assay does not hurt. The years go the way a word goes when you knew it a moment ago and no longer do. You may choose which nine. That is your right under Chapter, and I will honour it."

"Generous."

"Lawful."

"They are not the same thing, girl, and the distance between them is the entire history of this world." Enneth turned her head, offering the nape. "Do you know why we pay in memory here? Not the homily. The reason."

"The vesh binds the aquifer." Duhr set the disc against the thread. The coral warmed and took hold with a hundred small adhesions, like a mouth making up its mind. "Its mycelium holds the deep salt lattice open. Without it the water descends and does not return. It grows only on patterned neural substrate. We have no other patterned neural substrate to give. So we give what we remember, and it holds the water, and we live. This is taught to children."

"It is taught to children," Enneth agreed, "because it is exactly true and entirely a lie. Ask the next question."

"Which is?"

"Why does it require patterned neural substrate?"

Duhr's hand stopped.

It was not a question. It had never been a question. It was a property of the world, like the boiling point of water, like the mass of the salt. The vesh ate memory as fire eats air. Three hundred and eleven years of Hierate scholarship had catalogued that appetite in exhaustive detail, in eleven volumes, with tables — and had never once asked where an appetite comes from. She understood this in the space between two heartbeats, with the particular nausea of an accountant who finds the error in her own hand.

"Take your nine years," Enneth said. "I have chosen them."

The stone drank.

Duhr had performed four hundred collections and had learned to hold the incoming years at arm's length, the way a surgeon holds a body at arm's length. The stone took; she merely conducted. Nine years ought to have crossed her like weather — a childhood on a river that no longer existed, a wedding, a first grandchild, the taste of fruit grown in soil that had since gone to crust.

What crossed her instead was a woman she had never been, standing in a survey tent in a year before the Hierate had a name.

The tent smelled of hot canvas and machine oil. Through the flap: the pan, unbroken, white to the curve of the world. On the table, a core sample and a spectrograph and the numbers that had made eleven thousand colonists cheer four days earlier — water, an ocean of it, sealed under sixty metres of salt lattice that no drill could hold open. And in the lattice, threaded through it like rot through bread, a slow organism that had not eaten in eleven million years.

She watched a man she had never met — young, sunburned, careful — explain to the survey council that the thing in the salt would open the lattice, that it would hold it open indefinitely, that it wanted nothing they could not spare.

She watched him lie about the third part.

It had wanted nothing at all. It had been dormant, and content, and geological. They had woken it. They had taught it, over eleven months of patient trials, that a human memory was food — because memory was the only structure they possessed that the thing could parse, and they needed the lattice open before the ship's stores ran out. The first Assayers were volunteers. It was to be one payment, once, a founding sacrifice: forty-one people who gave everything they had.

And the organism, having been taught to eat, had not stopped being hungry.

That was the whole of it. Not a covenant. Not the sacred reciprocity of the Homilies. A debt incurred by forty-one frightened people on behalf of eleven thousand others, compounding for three centuries at a rate nobody had negotiated, serviced by every child born on Sabaea since. The Homilies had been written afterward, in the second generation, when the payments could no longer be hidden. Duhr understood the craft of that, too, and admired it the way one admires a well-set trap: a debt can be repudiated, but a devotion cannot.

She came up out of it on her hands and knees on Ordoval stone. The assay-stone lay dark beside her. Mother Enneth Ordoval was watching her with an expression Duhr had seen on exactly one other face — her own, in a mirror, the night she passed the Chapter examinations.

"Nine generations," the old woman said. "Mother to daughter, unwritten. Paper burns; my great-grandmother learned that with the archive at Tessik. I have no daughter." She lifted her collar and smoothed it, an old woman's small vanity. "The Hierate audits the vaults. It audits the houses. It audits the wells. It has never once audited the instrument."

"You have made me a courier."

"I have made you a creditor," Enneth said. "Learn the difference before you reach the bottom of the steps."

Duhr walked out of Tessik at moonrise, alone, leaving the palanquin and the bearers and the case with the Chapter and seal still inside it. She did not take the road.

Four kilometres onto the pan there was a bloom — one of the places where the vesh comes up to breathe, a low grey coral the size of a threshing floor, exhaling the cold mineral smell of deep water. Every Sabaean knew where the blooms were. Nobody went to them. You do not visit a creditor at home.

She had two choices, and she had understood both before she reached the bottom of the steps. She could carry the memory to Kir Sabaea, where it would be catalogued, and where she would be assayed to a blank that same evening. Or she could keep it, and be found at the next audit, and be assayed to a blank then. The Hierate had built a world with no third door in it.

But the Hierate had also built her, and it had trained her in exactly one skill, and it had never once considered what that skill was for. She was an instrument for moving memory out of a debtor and into a creditor.

And in three hundred and eleven years, nobody had ever paid the creditor in anything but childhoods.

Duhr knelt in the salt. She set the assay-stone against the bloom and her other hand at the base of her own skull, where the thread was, and she opened both ends of the throat she had been made into.

It took a long time. It was not painless. Somewhere in the middle of it she stopped being able to tell which of them was doing the remembering.

When it was finished, the coral under her palm had gone perfectly still — not dead; still, the way a room goes still when someone in it has just been told something. She lifted the assay-stone into the moonlight and read it out of habit, and it gave her a number she had never seen in four hundred collections and had been taught, in her first year, to record as a fault.

Zero. No depth. Nothing owed.

Behind her, three kilometres off, in the cistern at Tessik that had been dry for sixty-one years, something in the dark made a sound like a man clearing his throat before he speaks.