He came for her at dawn the next day, and he did not stand outside the door this time. He knocked, twice, and waited for her to say come in.

"You heard it," said Tavian.

Maren had been sitting on the edge of her bed with her boots half laced, and she did not pretend not to understand. "Yesterday. At the basin. Something tore."

"Yes."

"I didn't touch the door."

"I know. The bell told me you were on the landing, and also that you did not open anything." A faint pause. "It is a very informative bell."

"You could have shouted at me."

"I considered it." He regarded her with his usual unreadable steadiness. "Instead I have decided that the door is going to open anyway, and it is better for you to see it with me than to hear it through the wood."

She finished lacing the boot. Her fingers were steadier than she felt. "Is this the part where you tell me what you really do?"

"This is the part where I show you," said Tavian, "and you decide what you think of it."

The iron-bound door had no handle, and the basin beside it had grown a skin of pale mist in the night. He put his right hand into the water to the wrist. The mist drew in around his fingers, and the old wood let out a long, soft click, like a latch lifting somewhere inside the grain. The door swung inward on a silence so complete that Maren heard her own pulse.

Then she stepped through, and forgot to breathe.

It was a drowned cathedral.

She could think of no other way to hold it. The room fell away beneath her in a great stone well, perhaps sixty feet across and twice as deep, ringed by a spiral stair cut into its curved wall, and it was filled from the floor halfway to the roof with water that was perfectly clear and faintly luminous, like glass lit from beneath. And in the water, hanging in the green-gold dim, were the pages.

Hundreds of them. Pale, wide rectangles of paper, each as tall as a door and some taller, suspended on fine threads of black cord that ran up through the water to iron rings in the vaulted ceiling. They did not drift. They hung, quivering faintly, in rows and ranks and columns that stretched down into the dark, like a school of enormous silent fish all facing the same way. Every page was covered in ink, in a hand so fine and dense that from here the writing looked like water-lines on sand: deep blue-green, branching and returning, in tides.

And every page was breathing.

She could see it now, the exhale of the whole room: the slow synchronous swell and ebb of five hundred sheets, in, out, in, a great quiet lung lit green, and at the far end of each breath, from somewhere far below, the long low note of the bell.

"The Tide Ledger," said Tavian, at her shoulder. "Each page sets the water for one stretch of sea, for one cycle of days. The pages are written by the keepers. They are read, every dawn, by the Warden. That is all. That is everything."

She went down the first turns of the stair without being asked. She could not have stopped herself. It was like stepping into a library and finding the books alive. The paper was familiar, fibrous and cool, a heavy rag-and-weed sheet that she would have known blind. But it was not paper as she knew it. She could see the sizing, thick and faintly pearly; the long, fine fibres of something she thought might be a kelp; the deckle edges, ragged and beautiful, left exactly as the mould had made them. Whoever had formed these sheets had understood the stuff down to the molecule.

She stopped on the ninth step, a few feet from the nearest page.

"Rule two," she said, hoarsely. "I'm not touching."

"Thank you."

"But I'm going to look very, very closely."

"I would expect nothing less."

She bent toward it. A foot away, the surface resolved. She could see the fibres swimming up through the size, the tiny ridges where the pulp had been pressed, the soft, living shimmer of the surface tension where water met sheet. She could see the ink sitting in the paper rather than on it, bonded to the fibre. It was extraordinary. It was an art that no one in her world had practiced in a thousand years, if they ever had. For a long, giddy moment, she forgot that she was frightened. She forgot she was lost. She was a woman in a room with something wonderful, and her whole body lit up with a joy so simple and so unconditional that she was astonished to find she still had it.

"This is beautiful," she whispered. "Do you know that? This is the most beautiful sheet of paper I have ever seen in my life."

Behind her, Tavian did not answer. When she looked back, he was watching her face with an expression that she could not name. It was not the guarded look of the beach, or the closed look of the stair. It was something unfamiliar to her, because no one had ever looked at her that way: the look of a man watching someone see a thing he had been alone with for nine years.

"Come," he said, quietly. "There is something I should show you. I would prefer you saw it from here."

He led her along the curving stair, past ten, twenty, forty pages, down toward the lower levels, until they reached a landing from which one sheet hung close enough to read. He stopped her with a gesture, not a touch.

"Look."

She looked.

It was a page like the others in size and make, but something was wrong with it, and it took her a moment to name it, because she had only ever seen this in miniature. The ink was bleeding. At its center the writing was dense and dark, but toward the edges the letters thinned and softened, the blue-green fraying into a grey haze that crept outward through the paper like damp up a wall. In three places, long vertical fractures had opened in the sheet, pale lines where the fibres had simply let go of each other. The paper no longer breathed in time with the others. It lagged, heaved, stuttered, catching at the end of each cycle like a drowning man.

She could feel it, too, in her own chest. A hiccup, a hitch. A slight, queasy lurch in the long rhythm of the sea.

"That one governs the water between Orrel's Rest and Sennet Isle," said Tavian. His voice was very even. "Six days ago the ferry there lost a mast. Last night the channel ran backward for a quarter hour." He stopped, and she saw his throat work. "It is the fourth to fail this month."

She was still looking at the fractures. Her eye had already begun the old calculation without her: the failure mode, the cause, the options. Sizing breakdown. Fibre fatigue. Mechanical stress from the cycle itself, a thousand years of repeated flex. There was a tide-line of mineral deposit around the border of the sheet, rust-coloured, where the water had carried something it should not have.

"What do you do?" she said.

"When a page fails, a keeper is sent for. They come from the other islands. They write a new sheet, as close as they can to the old, and the Warden hangs it in its place."

"They copy it."

"They recopy it."

"And the old one?"

"Is taken down. And burned, in the cold furnace."

The blood went out of her face. She had stood in a lot of conservation labs. She had not often felt the urge to commit violence in one.

"You're burning them," said Maren.

"They are failed."

"They're not failed. They're damaged. Those are not the same thing." She heard her voice rise and could not stop it. "The ink is stable. Look at the core. It's the edges that are going, and the fractures at the fold, that's mechanical, that's the sheet, and the sheet can be consolidated. You can hold that. If you put in the right backing, if you support the fibres, if you reinforce around the original writing instead of replacing it..."

She stopped. She had said it out loud, in a dead language, to the only man in the world who could not possibly have understood it. She turned, flushed and furious, ready to be told that she was ignorant.

He had gone absolutely, utterly still.

"Say that again," said Tavian.

She swallowed. "I'm sorry. I get carried away. It's not my place..."

"No. Say it again. What you said about the copy."

"You're recopying it," said Maren, slowly. "You never repaired it."

The sea breathed in, through the stones. The page before them hung in the glowing water, hitching, struggling.

He was looking at her as if she had told him the sky was a different colour. Not rejection. Not anger. Something like vertigo.

"The keepers say," he said, carefully, "that a failed page cannot be mended. That it forgets. The ink loses the memory of the water, and a sheet that has forgotten cannot be taught again. It must be written fresh, from the keeper's own hand and the record of the old one." He drew breath. "They say it is a thousand years of method. I have never thought to question it. I have never had cause. I have only watched each new copy hold a little less than the last."

"A copy is only a picture of the writing," said Maren. "It's not the writing. You lose something every time. The memory, if that's what you call it. The thing the fibre knew." She hesitated. "You're not bringing the pages back, Warden. You're making cousins."

He was quiet for a very long time.

"Conservator," he said at last.

It was the word she had given him two days ago, in the round room, offered like a coin, and he had been keeping it all this time. He said it the way you say the name of a thing you had stopped believing in.

She found, to her horror, that her eyes had begun to sting.

"There are forty," said Tavian.

"Forty what?"

"Pages that matter." He nodded at the vast drowned room. "The rest are details. Weather, shoals, the small tides. But forty of them hold the great currents, the ones that keep the islands afloat, the ones that, if they fail all together, take the sea out from under the fishing grounds or the harbors, or put it in the streets." He did not look at her. "Nine years ago, there were forty and every one of them was whole. Today I count thirty-eight that are sound. Two more are going. I think it may be faster than I had calculated."

She understood, then, that he was telling her something he had told no one. It was in the care of the sentence. It was in the way he laid each fact down, one on another, like stones for a wall, and did not look at her until the wall was built.

"What happens if they all go?" she asked.

"The sea forgets how to keep time. The islands drown, or wither." He said it as though describing the weather. "And the Warden goes with them. That is the nature of the oath."

"The oath."

"I am bound to the Ledger. Each page that fails takes something from me." His left hand, in its grey glove, did not move. "That is the whole of it. You have seen the rest."

She had. She had seen the black line on the white wrist. She had seen the dry cracked skin like scorched paper, and a hand held out over water at midnight. She had not made the connection because she had not wanted to, and now it came all at once, and she had to put her palm flat against the cold stone wall.

The page in front of them hitched again. And somewhere above, in the stair she could not see, a single dull note sounded from the iron bell, and she saw him flinch, very slightly, at the base of his throat.

"Does it hurt?" she said, before she could stop herself.

"That is not a question for the pages," said Tavian.

It was not an answer. It was also, she thought, the nearest thing to the truth that he had yet allowed himself.

They climbed back up the stair together, he a step below her, and the pages slid past them in the green light, breathing. She did not speak. She had a feeling that if she tried, she would say something she could not retract, and she was not yet sure what it was. At the first landing he stopped to let her go through the door ahead of him. As she passed, a draught from the vault touched the back of her neck, and she turned.

He was gazing out over the room with a look so naked that she nearly looked away. It was not despair. She could have borne despair. It was something much plainer: a man who had held up a weight for nine years, with no one to tell, who had just noticed that someone had come into the room.

She did not know what she had meant to say. What came out was: "I'd want to see the fractures under magnification. I'd want to test the size. I'd want to know what the ink is, because it isn't a standard compound, and it won't take any consolidant I know without lifting." She pressed on, a little desperately, because he was still looking at her. "I'd want to work out how to do it without changing a single stroke. And I'd be careful. I would be very, very careful."

The silence went on for the length of one long breath of the sea.

"You would," said Tavian, and it was neither agreement nor refusal. It was a man putting down a thing that had been too heavy.

He led her up through the tower in silence, past the bell, past the oilcloth coats, to the kitchen where a pot of tea had been left steeping and a single plate of bread and cold fish had been set at each end of the long table. He did not eat. He stood at the window for a while, looking at the grey water, and then he asked her something that no one in Halvane had asked her yet.

"How did you come to it?"

"To what?"

"The work."

She laughed, a short, startled sound. "No one's ever asked me that."

"I am asking."

So she told him, and found, to her surprise, that she did not mind. She told him about the old binder who had taken her on at sixteen, a woman with huge hands and a voice like gravel, who had never once told her she was good and had never once let her leave early. She told him about the first book she had fully rebuilt, a child's primer, its spine shot, its pages foxed, and how it had felt to hand it back to its owner whole. She told him that she liked the smell of wheat paste and the feel of a bone folder against a fold, and that the best part of a repair was the moment when you set down your tools and the book simply sat there, quietly, existing, as if nothing had ever happened to it.

He listened. That was the extraordinary thing. He listened as no one had ever listened to her, with his whole face turned toward her and his right hand curled round a cup he forgot to drink from, and at the end of it, he said only, "That is a good reason."

"It's not a reason. It's an anecdote."

"It is a reason," said Tavian, "to do a thing slowly, and well, and with love."

The word sat on the table between them, a small bright thing neither of them touched.

She did not tell him about the notebook.

She thought about it. She had it in her mouth, as she sat there in the candlelight with the sea breathing around her. The book on the board upstairs. The six words. The seven torn stubs. The woman in the yellow kitchen who had walked out of her life on a Tuesday morning and left behind a thing that had answered the water. It would have been so easy. He was a good listener. She suspected he was a better keeper of secrets than anyone she had met.

But it was hers. It was the only thing she had left from that house, and the only evidence that her mother had once stood in a room and been real. She was not ready to put it on a table and let a stranger turn it over. Not even a kind one. Not even one who had looked at it as though it had said his name.

She was a conservator. She knew what happened to fragile things when too many people handled them.

So she said nothing, and the silence sat in her mouth like a stone, and across the table Tavian Orrel, who was keeping a stone of his own, nodded as though he understood.

He walked her up to the round room. At the door he stopped, with his hand on the frame, and for the first time she saw him hesitate over a sentence he had already composed.

"Conservator."

"Yes?"

"Eighty-two days." It was almost a smile. It might have been the lamplight. "I will not ask you to stay. I have no right. But I would ask you something else."

She waited.

He was looking at her hands, at the stained fingertips, the bandages she had unwound that morning without telling him, the small fresh scars from the rocks. His own right hand lifted slightly from the doorframe and fell again, and she thought, he wants to take my hand. He wants to look at it. And she thought it with such sudden, dizzy clarity that she nearly missed what he said next.

"Could you mend it?"

Very quietly. Almost like a man asking the sea for something it had no reason to give.

There was a whole answer in her. There was yes, rising up from the bottom of her chest, from the same place that had lit up in the vault at the sight of a single sheet of paper. There was yes, and there was I don't know, and there was a long-ago kitchen with yellow walls and a woman who had mended everything except the one thing she had broken. And somewhere under all of it was a small, plain, terrifying thought: that she did not want to go home yet. That for the first time in sixteen years, she had been asked a question to which the answer might matter.

"I'd need to look at it properly," said Maren. "I'd need time."

"You have eighty-two days."

"That's not what I..." She stopped, drew breath, and let the sentence go. "Ask me in the morning."

He inclined his head. He did not say good night. He turned and went down the stairs, one hand skimming the wall, and she stood in her doorway and listened until the sound of his boots had gone.

Then she went inside, and sat on the edge of the bed, and looked at the board by the window, where a tea-coloured book lay open under its row of sea-stones.

She had known the answer since the moment she saw the first sheet hanging in the water. That was the thing she could not forgive herself for. She had known, and she had already, silently, in the dark of her own chest, said yes.