Dawn did not so much arrive on Hanjian Peak as seep into it, a slow greying of the dark that crept over the ridgeline and found Ling Shuohan already awake and already moving.

He stood in the practice courtyard with the snow packed hard beneath his boots, and he drew Hanxue in one long, unhurried pull. The blade came out of its sheath with a sound like ice breaking on a still pond. Frost bloomed along the steel at once, white ferns spreading from the guard toward the tip, and the cold of it climbed into his wrist the way it always did. He had stopped noticing the cold years ago. What he noticed now was how far it climbed.

He began the first form. Rising Crane, Dividing Wind, Closing the Gate. Each movement was clean and spare, because that was how the masters of Hanjian taught and because he had never learned another way to be. His breath smoked in front of him. Snow lifted from the courtyard stones in small spirals behind each step, and the frost on the blade shed itself in glittering threads that hung in the air for a moment before they fell.

On the fourth form his left hand stuttered.

It was a small thing, a half-beat of weakness that no student watching from the colonnade would have caught. Shuohan caught it. He finished the form, sheathed the blade, and stood very still with his fingers curled around the hilt until the tremor passed. Then he flexed his hand and looked at the pale skin of his palm. The frost had left a thin white line across it, like a scar that had not yet decided to exist.

He did not look toward the eastern path, but he knew, as he always knew in the hour before the sun cleared the peaks, exactly where it lay. Eight years ago, on a morning very like this one, he had walked down that path to bring his teacher a bowl of hot millet and had found him lying in the snow beneath the plum trees. The old man's sword had been half drawn. His eyes had been open. His hair and his beard and the shoulders of his robe had been rimed with frost, and in the hollow of his throat, as light and bright as a joke, had lain a single pale petal of peach blossom.

Peach blossom did not grow on Hanjian Peak. Nothing so soft grew here.

Shuohan had been nineteen. He had carried his teacher down the mountain alone, because he had not trusted anyone else to touch him, and he had not shed a tear, because a disciple of Hanjian did not. He had told himself then, with the clear cold certainty of the very young, that if he had only been stronger, if he had only risen earlier, if he had only been the sort of man who could keep his people from dying, the old man would still be alive.

He had been getting stronger ever since. It had not helped.

"Senior Brother."

The voice came from the colonnade, young and careful. Shuohan turned and found a junior disciple standing at the edge of the snow with both hands tucked into his sleeves and his eyes fixed on a point somewhere around Shuohan's collar. The boy was perhaps sixteen. His name was Lin Wei, he came from a salt-farming village in the foothills, and he had been trying for two years to look Shuohan in the eye without success.

"Speak."

"The elders have asked for you in the Hall of Still Water. All three of them." Lin Wei swallowed. "They said it was not a matter that could wait for the morning meal."

Shuohan inclined his head. He did not ask what the matter was, because the boy would not know, and because some part of him already did. For three months the elders of Hanjian had spoken in low voices behind closed doors, and for three months a letter with a vermilion seal had been passing between the Peak and the valley, and for three months the frost on Hanxue had been creeping up his arm a little further each week. A man did not need to be clever to add those things together.

He crossed the courtyard. The snow squeaked under him. When he passed Lin Wei the boy flinched, just slightly, at the cold that rolled off him, and Shuohan felt the old reflexive twinge of something that was not quite shame. He kept walking.

The Hall of Still Water was the oldest building on the Peak, a long low room of black timber and white plaster where the elders met to speak of things that mattered. Three of them sat behind the low table in the grey light. Elder Lu, who had taught him the sword and had held his shoulder at the funeral. Elder Shen, whose hands shook now and whose mind did not. And Elder Qu, thin as a winter reed, who rarely spoke and was therefore always listened to.

"Shuohan." Elder Lu gestured to the cushion across from them. "Sit."

"I will stand."

Elder Lu sighed through his nose. It was an old argument, and none of them had the heart to have it. "The rite has been decided," he said instead. "The red candle ceremony. The two halves of Liangsheng are to be brought together under one roof for a hundred nights, and sealed, and the curse laid to rest. The valley has agreed. Qingyun Pavilion has agreed."

Shuohan heard the words clearly. He found that they did not mean anything yet.

"The ceremony requires the two bearers," Elder Qu said, in his thin dry voice. "One to hold Hanxue and one to hold Taoying. And a vow between them, sworn before witnesses and sealed by candlelight."

"A vow."

"A marriage vow," Elder Shen said, quite gently. "It is the only form the old texts will bear."

The courtyard cold was still in Shuohan's lungs. He thought, absurdly, of Lin Wei's flinch.

"And the bearer of Taoying?" he asked.

The elders looked at each other. It was Elder Lu who answered, and he did it the way a man steps onto a frozen river, testing each footfall.

"Qingyun has named Bai Yunzhao."

For a long moment Shuohan said nothing at all.

His thumb had found the hilt of Hanxue without his permission. It moved against the wrapped leather in a slow, steady stroke, back and forth, the way it did when he was thinking something he did not want anyone to see. He made it stop. It started again.

Bai Yunzhao.

He had met the man exactly once, and once had been enough to last him six years.

Wolf's Gate was a narrow pass on the border between the two territories, a place of black rock and bad wind where disputes about grazing and tolls and the ownership of a single spring had been settled by blood for longer than anyone could remember. Six years ago the dispute had been settled by sword instead, a single duel between one champion from each sect, because both masters had grown tired of burying their students. Shuohan had been twenty-one and had been told to win. He had won.

But not easily. He remembered that clearly, and with a resentment he had never been able to put down. The man from Qingyun had been quicker than anything he had ever faced, a flicker of white and pale blue that slid around every guard he raised, laughing the whole time, actually laughing, as if the whole thing were a game being played at his own expense. The fight had lasted forty exchanges. On the forty-first Shuohan had finally pinned the other man's blade against the rock, and the man from Qingyun had looked up at him from half a hand's breadth away with bright brown eyes and said, quite cheerfully, "Ah. You've got me. Well done."

Then he had yielded the match, bowed, and walked away.

It was only afterward, in the quiet, when Shuohan had gone to wipe down his sword, that he had found the petal. A single pale pink petal of peach blossom, tucked neatly beneath the cord that bound the hilt, as if it had grown there. He had not felt it placed. Forty exchanges, and the man had still found a moment to do that.

It had been an insult. It had been a signature. It had said: I could have won, and I let you think otherwise, and I want you to know it. Shuohan had never told a living soul about it, because describing the insult would have made it real.

He had been angry for six years about a flower.

"Shuohan," Elder Lu said carefully. "You understand why it must be him. Hanxue and Taoying were forged as a pair. The bearers must be the ones the swords themselves have chosen, and both blades answered the two of you when you met at Wolf's Gate. If you have objections..."

"I understand."

"If you have objections..."

"I said I understand."

His voice came out flatter than he intended, and frost curled across the black wood of the table between his fingertips and the elders' cups. He was not aware of having touched it.

Elder Qu was the one who broke the silence. He leaned forward very slightly, and the movement was so rare that all three men turned to look at him.

"Show us your left hand."

Shuohan did not move.

"Please," said Elder Qu.

It was the word that did it. Shuohan drew off the black bracer and held out his hand, palm up, over the table. The pale line was still there across the center of it, thin as a hair, and now that it was in the light of the hall it was clearly not a scar at all. It was frost. It sat under the skin, delicate and crystalline, and when Elder Qu reached out and touched it with one dry fingertip it did not melt.

"How long?" Elder Qu asked.

"Three months. It began at the wrist."

"And the tremor?"

Shuohan's jaw tightened. "Since the autumn. It comes in the mornings."

Elder Shen made a small sound, a breath through the teeth. Elder Lu closed his eyes.

"That is how it began with your master," Elder Qu said. He did not say it unkindly. He said it the way a physician names a disease. "Almost exactly. Three months of frost in the hand. Then the tremor. Then the weakness, and the sleeplessness, and the long cold afternoons when he could not feel his feet. We did not understand it at the time. We thought it was age." His thin mouth moved. "He was not old enough for it to be age."

"The blade is drawing on you," Elder Shen said. "It has begun to take your strength to feed the curse. Without the rite, without the seal, it will go on taking it, a little more each season, until..."

"Until I am found in the snow," Shuohan said.

No one contradicted him.

He looked down at his own open hand. In the sunless light of the Hall of Still Water it looked like someone else's, long and pale and strangely fragile. Eight years of discipline, of mornings on the courtyard stones and nights at the whetstone and silence, and none of it had mattered. The thing that had killed his teacher had been waiting patiently inside the sword the whole time, and it had been waiting for him.

He was not afraid to die. He examined the thought honestly and found that it was true. What he felt instead, rising slowly through his chest like cold water filling a well, was something much closer to fury.

"And the Qingyun bearer," he said. "Does he suffer the same?"

"We do not know," Elder Lu said. "Qingyun does not confide in us, and we have not asked."

Shuohan folded his fingers closed over the frost in his palm. He thought of a peach petal in the hollow of an old man's throat, and of how neatly it had lain there, and he let the fury rise a little higher, because fury, at least, was warm.

"Then let me ask the question none of you will," he said. "Why Qingyun?"

"Because Taoying is theirs..."

"Taoying could be broken. Or buried. Or thrown into the sea." His voice had not risen, but the temperature in the room had dropped enough that Elder Shen reached for his tea and found it clouded at the rim. "Eight years ago my teacher was found in the snow with a peach petal at his throat. I did not need a court to tell me whose petal it was. And you now ask me to stand in a hall of red silk and take that sect's bearer as my..."

He could not say the word.

"We have no proof it was Qingyun," Elder Lu said.

"No. You have always said that."

"Because it is true."

"And because it is convenient."

That landed. Elder Lu's face did not change, but something moved behind it, old and tired and carefully kept. "Shuohan," he said. "I held your teacher's hand before he died. I know what I do not know. But I know this as well. We have tried everything else. We tried the forge-hall's reworking. We tried burial rites, and sealing, and a year of fasting. Elder Qu spent two winters in the archives. The curse is not in the steel alone. It is in the bond between the halves, and that bond can be answered only by the two who bear them."

"Can it be answered by someone else?"

"No."

"Can it be answered by a different Qingyun disciple?"

"The swords chose," said Elder Qu. "We do not."

Shuohan stood in the middle of the Hall of Still Water and understood, with the clarity of a man finally reading the last line of a letter he has been avoiding, that there was no door in the room he had not already tried. He could refuse. He could walk out into the snow and refuse, and Hanxue would keep drinking from him, and in a year or two Lin Wei or some other boy would carry him down the mountain. Or he could do the single thing he least wished to do in the whole of his life, and live.

He was a disciple of Hanjian. He had never once failed to choose the path that cost the most.

"When?" he said.

"The officiant will send word of the hour and the place," said Elder Lu. "Nothing is required of you until then but to be ready."

"I will be ready."

He put the bracer back on. He bowed, the precise depth owed to elders and not a hair more, and walked out of the Hall of Still Water. Behind him no one spoke. Only when he was halfway across the courtyard, in the thin gold light that had finally cleared the eastern peaks, did he hear Elder Shen say quietly to the others, "He is shaking."

He was not. It was only the frost.

He did not go back to his quarters. His feet took him east, down the path beneath the bare plum trees, to the small terraced hollow where the snow lay deepest and the wind could not reach.

There was no great monument. Hanjian did not believe in them. A flat stone stood at the head of the mound with a single character cut into it, and Shuohan had kept the snow off it with his own hands every morning for eight years, so that it had never once been buried. He knelt now in the cleared place and set his sword across his knees.

"Shifu," he said.

The wind moved in the plum branches. A little powder of snow sifted down and settled on his shoulders.

"They have chosen the rite. I am to be married." The word felt strange in his mouth, a stone he had been told to swallow. "To one of them. To the one who left a flower on my sword. I think you would laugh, if you were here. You laughed so rarely that I would almost pay to hear it."

He was quiet for a time.

"The frost is in my hand," he said at last, very plainly, because this was a place where he did not need to be anything other than plain. "It is the same as yours. I did not tell the elders how afraid I was of it when it began. I am telling you."

No one answered. No one ever had. He did not mind. The silence of this place had held him up for eight years in a way that no voice ever had.

"I do not know if I can do this," he said. "I do not know if I can put my hand in his and keep my face still. But I will do it, because the alternative is to leave your death unanswered, and I have never been able to bear that. Whatever the curse is, whoever made it, whoever sent the blossom, I will find them. I will break the sword if I have to. I will break myself against it. I will not let it be you, and then me, and then some other student on some other cold morning."

He bowed until his forehead touched the snow. It burned, and then it numbed, and he stayed there a long moment while the cold gathered in his ribs and shook the oath out of him syllable by syllable.

When he straightened, there was frost on his eyelashes and a thin white crust across the backs of both his hands. He rose, and bowed once more, and turned to go.

And then he stopped. Because somewhere in that last vow, the some other student had acquired a face. A bright brown gaze, and a careless, unforgivable smile.

He told himself it was only because the man would be in the room. He did not examine the thought further.

His quarters were a single room at the end of the northern corridor, bare as a monk's cell. A pallet. A low desk. A rack for the sword. A lacquered box the size of a man's palm, resting on a shelf where it had rested for six years.

He sat down on the floor in front of it and did not touch it for some time.

Then he lifted the lid.

The petal lay on a square of white silk. It had dried to the colour of old paper, curled a little at the edges, translucent as the wing of a moth. He had taken it from the hilt of Hanxue on the evening of Wolf's Gate, intending to burn it in the brazier. He had held it over the coals. He had stood there for the better part of an hour with the heat pressing against his knuckles, and the petal had trembled in the updraft, so light and so ridiculous, and he had not been able to let go.

He had told himself, that night, that he was keeping it as evidence. That a man ought to hold on to proof of an insult. He had told himself the same thing every year on the anniversary, and every year he had opened the box once, looked, and shut it again.

Now he lifted it between two fingers. It weighed nothing at all.

The frost had spread across his palm again and he saw it touch the petal's edge and freeze a single fine crystal along the vein of it. For one strange heartbeat the dead flower looked almost alive, rimed and bright and trembling. Then Hanxue, standing in its rack across the room, gave a long low note, as a struck glass sings, and Shuohan felt something answer it very far away, thin and sweet and faintly warm, like a voice calling from the far side of a mountain.

He went still.

Somewhere beyond the ridges, in a valley he had never visited, a second sword was being asked a question.

He set the petal back on its silk and closed the lid with great care, and he sat for a long time with both hands flat on his knees, breathing, until the note faded from the air and the frost drew back from his skin. His ears were burning, which made no sense at all in a room this cold.

"It is only the sword," he said aloud, to no one. "Nothing else."

The letter came at sunset.

Lin Wei brought it, holding it out at arm's length like a cup of something hot, and Shuohan took it from him without comment. The paper was heavy and a deep red, folded in thirds and sealed with a bead of black wax. He broke the seal and unfolded it standing in the doorway while the last light slid down the western face of the Peak and turned all the snow to rose.

The handwriting was quick and elegant and a little too pleased with itself.

"Ling Shuohan of Hanjian Peak," it began. "You do not know me, though I know you rather well. I am Gu Chiyan, and I have been asked to conduct this absurd and necessary business. I will not insult you with pleasantries. The ceremony will be held at the Chiyan Lodge on the boundary road, at the hour of sunset, three days from today. Come alone, or with one companion if you must. Bring Hanxue. Do not bring anger, if you can manage it. It makes the candles nervous.

"You will find that I am on neither side. I am on the side of the candle.

"G.C."

Beneath the signature, in the same dark ink, was a single small flourish. Shuohan had to hold the paper closer to the light to see what it was.

It was a peach blossom. Five round petals, drawn in a single casual stroke, as if the writer had not thought about it.

He stood in the doorway with the red letter in his hand and the cold wind pulling at his collar, and he looked at the little flower for a long time. Down in the valley, very far away, the first lanterns were being lit.

Three days.

Behind him in its rack, Hanxue hummed once more, softly, like something that had been told a secret.