On the seventeenth night, Ling Shuohan fell asleep.

Yunzhao did not believe it at first. He lay on his side beneath the blue quilt with his eyes slitted and his breath carefully measured, as he had lain every night for sixteen nights, and listened to the other man not sleeping. It had become a kind of music to him, the long steady silence from the floor by the wall, the occasional creak as a muscle shifted, the soft dry whisper of a thumb moving along the cord of a sword hilt. He had learned its rhythms the way one learns the rhythms of a tide. He knew when it was at its fullest. He knew the small hours when it ebbed.

Tonight, somewhere past the third watch, it stopped.

Not with a sound. There was no sigh, no stir. There was only a change in the quality of the quiet, as when a held note comes to rest. A deepening. A loosening. He waited. He counted a hundred breaths, and then a hundred more, and the silence did not break, and at last, very carefully, he turned his head on the pillow and looked.

Shuohan sat against the wall with his chin tipped forward and his hands slack in his lap. Hanxue lay across his knees, forgotten, the hilt resting loosely in the curve of his fingers. His hair had come half out of its pin and lay along his cheek in a long dark swag. The candlelight was kind to him. It softened the hard lines of the jaw, and smoothed the little crease between the brows that never, in the waking hours, went away, and left a face that Yunzhao had not seen before and was not at all sure he was permitted to look at.

He looked much younger. That was the first thing. He looked like a man who had been told, a very long time ago, that he must never put something down, and had at last, without noticing, put it down.

The frost was going.

It had lain all week across the boards beneath him, in the wide white fan that was as much a part of the room now as the table or the bed. Tonight it was thin. It was fading from the edges in toward the center, slow and silent, as a breath fades from a cold window, and where it left the wood the planks were dark and faintly damp. Even the blade across his knees had shed its rime. The steel gleamed in the candlelight, bare and bright and quiet, like a thing that had stopped waiting.

He watched it for a long time.

He was aware, in the small cold hollow beneath his ribs, that this was a gift. That it had been placed in his hand, without ceremony, by a man who did not know he was giving it. And he was aware, too, that he had been waiting for exactly this for seventeen days, with all the patience of a thief and all the guilt of a man who has begun, against his better judgment, to love the house he means to rob.

The key was warm against his forearm.

He had not noticed it begin. He thought perhaps it had been warm for some time. It lay in the lining of his sleeve, a small flat shape no longer than his thumb, and it seemed to him, though he knew it could not be so, that it was beating faintly, like a second pulse.

He sat up.

* * *

Chiyan had said it so quietly, on the night of the contract, in the snow outside the hall.

Yunzhao could still hear it. A light cool voice, a hand warm on his own, the key sliding into his palm. Behind the cord of beads, low, near the floor. You will find a place where no plaster ought to be. Do not go before the bond has settled, or it will notice you. And then, with a small bright smile, as though he had told a joke: When you are ready, I shall be most interested in what you find.

He had not been ready. For seventeen days he had told himself that he was not ready. That the bond was still unsettled, that the man on the floor never slept, that a hundred things stood in the way. They had all been true. They had also been, he understood now, rather convenient.

He put his feet on the floor.

The boards were cold. He did not make a sound. He crossed the room in the shadows beside the bed, the long way round, so that he did not pass between the sleeper and the candles, and came to the far wall where the cord of wooden peaches hung. In the soft light the beads shone like a string of small embers. Seventeen of them had gone white. Eighty-three still burned, red and patient, and beside them, pinned to the plaster with a nail, hung the crooked treaty in its two hands.

We do not lie to one another.

He did not read it. He had read it a great many times.

He knelt. He lifted the end of the cord, very gently, so that the beads would not click, and drew it aside. The plaster behind it was pale and smooth, a little grubby with age, and it showed nothing. He ran his palm slowly down the wall from shoulder height to the skirting, and halfway down, at the level of his knee, his fingertips caught on something. A seam. So fine that he felt it more than saw it, a hairline running up from the floor in a straight line, and another across, and another down, enclosing a rectangle about the size of a small door.

And in the lower corner, so cunningly painted over that it might have been a knot in the wood, a small round plate of brass with a keyhole in its center.

He took out the key.

It was warm. It was almost hot. It seemed to turn toward the lock of its own accord, as a plant turns toward the light, and when he fitted it into the plate he did not have to push. It slid home with a soft round click, like a pebble dropping into a well. He glanced over his shoulder. The man on the floor had not moved. The candles burned on the table, tall and gold and steady, and the light lay across the frost-stained boards and the sleeper's face, and nothing was wrong.

He turned the key.

The panel swung inward without a sound. A breath of air came out of the dark behind it, cool and dry and tasting of old paper, and iron, and something else, faint and bitter, like the smell of a long-cold forge.

* * *

There was a passage.

It was very short. Three paces long, perhaps, and just wide enough for a man's shoulders, floored in grey flagstone and walled in rough unplastered stone that sweated faintly in the cold. A little light came in from the candle room behind him, and by it he could see the whole length of the thing from one end to the other. It did not turn. It ran straight as a rule to a dark square of iron at the far end, and he understood, with a small dry flicker of admiration for whoever had built it, why.

A straight passage meant that anyone standing in it could see the candles.

The fourth clause. The flame must be within sight of both of them for the length of the night. He had not thought of it until this moment, and he almost laughed. Whoever had designed the lodge had known precisely what they were about. The archive had been put where the bearers could reach it without leaving the flame. It had been put there so that they might.

He stood at the mouth of the passage and looked back. He could see the table. He could see the two candles, straight and unwavering, and the red-gold edge of their light on the sleeping man's sleeve. He stepped inside, and the light went with him. It was a long, thin, wavering line along the floor, and it lay at his feet like a thread that he could follow home.

He went forward.

One pace. Two. The cold was deeper here. The stone seemed to breathe it out. He kept one hand on the wall and the other on the hilt of Taoying, which had gone quite quiet at his hip, and with every step he felt a faint cool pressure on his skin, as though the passage were thick with some fine invisible dust. Three paces. He stopped.

The door was iron.

It was not a large door. It came no higher than his shoulder, and it was banded across with three flat straps of black metal, riveted at the corners, and the whole surface was crusted with a fine bloom of grey like mold. There was no handle. There was no lock. Where the lock should have been, across the join of door and frame, hung a thick disc of dull lead the size of his palm, threaded onto a loop of braided wire, and stamped, deep and clean, with a single device.

He bent to look.

It was a hammer. A short-hafted smith's hammer, with a heavy square head, crossed over an anvil. And above the hammer, rising out of its crown in three curling tongues, stood three small flames.

He had seen it before. He could not think where. It tugged at the edge of his memory, a half-recognized shape in a dream, and he put out his hand without quite meaning to and touched the disc with one fingertip.

It was warm.

It was warm in the way that the key was warm. A faint, steady, living heat, as of something that has been waiting. And beneath his finger, very faintly, he felt it hum.

He snatched his hand back.

The seal. It was the forge-hall's seal. Every sword made in the great forge of the mountain bore a mark like it, stamped into the tang, and every document that left the forge-hall had been closed with one. It was lead and wire, the cheapest and surest of locks. A man might cut the wire, but he could not mend it. A broken seal could not be made whole. Whoever came after would see it, and would know.

He stood with his fingers curled against his palm.

There was nothing to be done. Not tonight. He had no cutter, no thin blade, no means of opening the thing without leaving a mark, and a mark would be read like a signature. He could have broken it. He could have taken Taoying from its sheath and cut the wire with a single stroke, and then he would have been in the archive, among the papers that might have told him what the old master had meant. And in the morning someone would have come, and seen, and asked who had been in the lodge. And there were only two possible answers.

He thought of a grey-eyed man asleep on the floor. He thought of what would be in those eyes when they learned.

He was still standing there, hand half raised, undecided, when he heard it.

"Yunzhao."

* * *

It came from behind him, from the candle room. It was very low, hoarse and thick with sleep, and it was quite without alarm. It was not a call. It was only a name, said once, as a man says a name in a dream.

He did not breathe.

"Yunzhao," said the voice again, a little more urgently. And then something else, quieter, less distinct, a sort of broken murmur, the sound of a man who had begun to speak and lost the thread of it. "Do not. Do not go out."

He was out of the passage in four strides.

He did not remember afterward how he closed the panel. He had turned the key, and drawn it out, and shut the little door with the flat of his hand, in one long smooth silent movement, and let the cord of beads swing back across the seam. He did it with his body, without thought, as one catches a falling cup. Then he was across the room and on his knees beside the sleeper, with his heart going like a drum, and the key clenched in his fist like a stone.

Shuohan had not woken.

He had slid a little sideways against the wall. His head had fallen to one shoulder. His lips were parted and his brows were drawn together over closed eyes, and a fine sheen of sweat stood on his forehead. He was dreaming. Yunzhao could see it in the quick flutter of the lids, in the little tightening of the throat as a man swallows something that will not go down. The frost was coming back, a thin white lace creeping out from beneath his palm across the planks.

"Shuohan," he said softly.

No answer.

He thought of waking him. He would be well within his right. A man who was having a nightmare ought to be woken, and there was a clause for it, written in his own hand. Injuries shall be attended to. Without comment. He put out his hand and laid it on the other man's shoulder.

The eyes opened.

They did not see him. They were wide and grey and unfocused, looking at something far beyond the room, at a clearing, perhaps, or a long white path, and the pupils were huge. A hand shot out from the folds of the robe and closed around Yunzhao's wrist with a grip like a trap. It was cold as iron. It hurt.

"Shifu," said Shuohan.

It was barely audible. It was the voice of a boy, rough and young and scraped raw. "Shifu, you must not go out in the snow. It is too cold. Please, I have brought the millet, it is still hot, I will carry it..." The fingers tightened. "Do not go without me. Please. I will be stronger. I will get up earlier. I will not let it happen. Please. Please stay."

Yunzhao could not move.

He knelt there on the cold boards with the other man's hand locked around his wrist and the key biting into his own palm, and he could not so much as draw a breath. He had heard that voice before, though not from this mouth. He had heard it in the sickroom of the old master, in the last grey week, from a boy of twenty who sat by a bed and held a dying man's hand and said, over and over, do not go, do not go, to a face that no longer heard him. He had been that boy. He knew every note of it.

"I am here," he said.

It came out thick. He did not know what he was saying. "I am here. I am not going anywhere. You may let go. It is only the cold."

The words he had once heard said to himself. The words that no one had said, in the end, to the boy by the bed. He heard them go out into the quiet of the little room, and he thought that they were the first true thing he had said in seventeen days.

The grip eased.

It did not release. It slid downward, from wrist to hand, and the long cold fingers turned and threaded themselves through his own, as a child's would, without thought, and held. The brow smoothed. The breath went out of the chest in a long, slow, shuddering sigh. The eyes fell closed. Beneath their joined hands the frost on the floor paused in its creeping, and then, very quietly, began to retreat.

"Stay," said Shuohan, so softly that it was hardly there.

Yunzhao stayed.

* * *

He sat beside the sleeping man for the rest of the night.

He did not move. He did not dare. His knee was stiff on the planks and his back began, after the first hour, to ache with a dull persistent fire, and his hand, caught in that cold slack grip, went numb to the wrist and then began, slowly, to prickle. He did not shift it. He leaned back against the wall beside the sleeper, so near that their shoulders almost touched, and watched the candles burn, and thought.

There was a thing he had done not to look at, for seventeen days, and he looked at it now.

He had come to this house for a purpose. He had a debt to a dead man, and a clear and solid reason, and a key. He had meant to use the hundred nights as one uses a tide, to go in under the wall while the guards were looking out to sea. It had been a good plan. It had been a necessary plan. He had gone through it, again and again, on every sleepless night, and found no flaw in it.

He had simply not accounted for this.

For a man who talked in his sleep, and held on. For a boy of nineteen who had carried a bowl of hot millet down a path in the dark and found nothing at the end of it. For a face that Yunzhao had once seen at a graveside, bent in the snow, and had never been able to forget. He had thought that he was robbing an enemy. He had thought it was simple.

It was not simple. It had not been simple since the day of the hall.

He looked at the cord of beads on the wall. Seventeen white. Eighty-three red. And beside it a scrap of paper in two hands, with three words in the middle of it that he had signed in his own flowing script and could no longer stop reading. We do not lie.

"Not tonight," he whispered.

He did not know to whom. To the key, perhaps. To the iron door, and the seal, and the dead man who had told him not to believe it was only the sword. He said it to the candles, and to the cold, and to the man beside him, who slept on in the soft gold light with his fingers wound through Yunzhao's and the frost drawing back from the floor like a tide going out.

"Not tonight. But I will. I swear it. And I will tell you before I do."

It was a vow. He knew it for one as soon as it was out. It sat in the air a moment, thin and frail, and he felt it settle somewhere beneath his ribs and take root, as a seed does that has fallen on stone and found, to its own surprise, a crack.

He did not know if he would keep it. That was the worst of it. He only knew that he had said it, and that it was true, and that in the grey light of the lattice the first small thread of morning had begun to creep across the sill.

* * *

He slid his hand free a little before dawn.

It took a long time. He did it by fractions, a finger at a time, holding his breath, and when at last the last cold knuckle slipped away he sat for a moment with his heart pounding as though he had cut a rope. The sleeper stirred, frowned slightly, and settled. Yunzhao rose, with a stifled grimace as the blood returned to his leg in a thousand needles, and went to the bed, and lay down on top of the quilt with his back to the room.

He closed his eyes. He made his breathing slow.

It was a very long time before the candles folded themselves out.

He heard the small dry click from the wall as the seventeenth bead paled. He heard the first thin note of a bird. And he heard, quite close, a sharp quick intake of breath, and the creak of someone sitting suddenly upright, and a silence in which a man looked at his own empty hand.

He did not move. He lay with his eyes shut and his whole body listening.

"Yunzhao," said Shuohan.

It was low and a little rough. It was the voice of a man who had been given something and did not know what.

"Mm," said Yunzhao, into the pillow, with the long drowsy drag of a man dragged out of sleep. "Is it morning?"

"I slept."

"Did you." He rolled over, yawning, and propped himself on one elbow. His face was rumpled and innocent. His heart, he thought, must surely be audible across the room. "How very enterprising of you. I was beginning to think it was against your religion."

"I did not dream."

"Wonderful."

"I have not slept without dreaming in eight years." He was staring at his hand. He turned it over, and over again, as though it were a stranger's, and looked at the clean dark boards beneath him where there was no frost at all. "There was something. I think there was someone. I cannot..." He shook his head. "It was warm."

Yunzhao felt his smile start to rise.

He stopped it. He stopped it with an effort that made his jaw ache, and let what came instead be only a small crooked softening at the mouth, which he did not try to name. "Perhaps it was the soup," he said.

"Perhaps."

"Or the fish."

"The fish," said Shuohan gravely, "is a very restful fish."

It was such an absurd and unexpected sentence that Yunzhao almost lost his composure entirely. He turned his face into the quilt and pressed his lips together until the shaking passed. When he looked up, the grey eyes were fixed on him with an expression he could not interpret, searching, a little puzzled, a little shy, as of a man who senses that there is something just beyond the edge of his sight and does not wish to scare it.

"Thank you," said Shuohan.

"For what?"

"I do not know."

Yunzhao looked at him for a long moment. Then he said, very gently, "You are welcome," and got up to see about the kettle, and did not say that he had held the hand that was holding his, or that he had seen the frost go out of the floor, or that he had stood in an iron-doored passage in the middle of the night and made a vow to a man who did not know he was owed one.

He was not lying. He told himself that. He had only not yet said.

It was a very thin line, and he walked it all the way to the hearth.

* * *

He saw it as he was setting the kettle on the hook.

Hanxue lay where it had lain all night, across the folded red robe against the wall. Its hilt was turned toward him. The leather cord that bound the grip had slipped a little in the long cold of the night, and beneath it, at the very base of the pommel, in the place where a sword-maker leaves his name, a small bright mark was visible in the grey light.

He had seen it a hundred times. He had never once looked.

He set the kettle down. He crossed the room as in a dream. He did not touch the blade. He bent over it with his hands clasped behind his back, like a man looking at a thing in a shop window that he cannot afford, and looked at the little engraved device, no larger than a fingernail, cut by some long-dead hand into the steel.

A short-hafted hammer, with a square head, crossed over an anvil. And above it, rising from the crown of the hammer in three curling tongues, three small flames.

It was the same.

It was exactly the same, line for line, down to the little nick in the left-hand flame. The mark that sealed the iron door at the end of the passage. The mark that was on the lead, and the wire, and the key. The mark on the sword that had killed an old man in the snow.

Behind him Shuohan was saying something about breakfast. He did not hear it. He stood with the cold light on the back of his neck, and the taste of old paper in his mouth, and the very distinct and quite terrible conviction that he had just walked into a room that he would never be able to leave.