At midnight, the city of Seoryeon held its breath, and Nahee Vael stepped through the gap it left behind.

The thirteenth hour did not arrive with a sound. It arrived the way a held note arrives after the singer has already stopped, a thinning of the air above the old quarter's tiled roofs, a stillness in the river that was different from sleep. Down in the lanes the streetlamps went on burning, but their glow lost its weight. Up on the ridge of the roof where she crouched, the wind turned into something that tasted faintly of copper and rain. Nahee pressed two fingers against the silver ring on her thumb, the way she always did at this moment, and looked for the thread.

It was not hard to find. It never was. The old man stood three roofs away at the edge of a crooked chimney, a faint shape in a quilted vest, his slippers still on his feet. He had been dead for eleven days. A thread of longing ran out of his chest like a strand of spun sugar, thin and amber and trembling, and it pointed toward the roof of the neighboring house, where one grey tile sat a finger's width out of place.

"Mr. Pyo," she called, softly, and he turned.

She had learned long ago that the dead did not like to be startled. They had spent days or years drifting through a world that no longer answered them, and a sudden voice could scatter them like pigeons. So she walked the ridge slowly, boots finding the seams between the tiles, her coat flaring around her knees, and she let him look at her until he decided she was real.

"The rain comes on Thursday," he said, as if they had been mid-conversation. "That tile has been loose since spring. I told my daughter. She said she would call someone."

"I know," Nahee said. "I can see it."

"Then you understand."

"I do."

She did not tell him that she was a Tracker, that she followed the threads of unfinished wishes the way other people followed a river to the sea, or that his daughter was asleep three streets away with the first grey in her hair and no idea her father had stood on her neighbor's roof every night for eleven nights. Those things were not what he needed. What he needed was a tile.

She took hold of his thread, wound a loop of it around her left hand, and let it lead her. It tugged across the gap between the two roofs and she jumped it without looking down, because looking down was how people hesitated and hesitation was how Trackers got hurt. The grey tile was cold and slightly damp. She pressed it back into its seat until it clicked, and the amber thread went slack between her fingers, then bright, then very quiet.

Behind her, Mr. Pyo made a small sound that was half a laugh.

"Oh," he said. "That's all it was."

"That's all it ever is," she said, and tied off the thread with a Tracker's knot, three turns and a tuck. The thread unspooled into the air above his hands. For a moment the old man was only a pale outline of a man in a vest, and then even that was gone, and a single bell rang somewhere over the river, a long clear note, and faded.

The price came as it always did, a small cold hole where something had been. Nahee stood on the roof and waited to learn what had been taken. Sometimes it was a face, sometimes a song. This time she reached for the color of the umbrella she had carried to school as a child, and found only a pale outline of an umbrella, no color at all. She stood there with her hand pressed flat against her sternum for the length of two breaths.

Then she let it go. That was the trade. A Tracker who mourned every small loss would never finish a night's work, and Nahee Vael finished every night's work. It was the one thing about herself that she had never needed to doubt. If you were always the one who went looking, you were never the one who got left behind.

She was halfway down the drainpipe of the neighboring house when she saw the man waiting for her on the steps.

He stood at the bottom of the stone stairs that led down to the lane, utterly still, in a grey coat buttoned to the throat. He was young, perhaps twenty-five, with a narrow, careful face and a pin on his lapel in the shape of a closed book stitched in red thread. Nahee knew the pin. Every Tracker did. It meant Ledger Hall, the old and quiet institution that kept the accounts of the thirteenth hour, and it was the last thing anyone in her trade wanted to see on a stranger at one in the morning.

"Miss Vael," the man said. He bowed at exactly the correct depth. "My name is Sul. I apologize for the interruption. I waited until you had finished."

"That was considerate." She dropped the last meter to the ground and dusted her palms against her coat. "Hall doesn't send people to find me, Mr. Sul. Hall sends letters, usually rude ones, usually about my filing."

"This is not a matter for a letter." From inside his coat he drew a tube of black lacquer, no longer than her forearm, sealed at each end with red wax. The seal showed the same closed book as his pin. "The Auditors have reviewed your record. They find it exceptional. Seventy-one sendings this year without a single unresolved thread, the highest figure in the city."

"Seventy-three," Nahee said.

Sul blinked. "I beg your pardon?"

"Seventy-three. Your Auditors miscounted. Two of them were children and I filed them under a different heading." She heard how sharp her own voice was. She was tired, and the hole in her memory was still fresh, and she disliked the way he held the tube out to her with both hands like an offering. "What is it?"

"A contract. Your ninth, in Hall's records."

"I've never had a contract from Hall."

"No," Sul agreed. "But it is the ninth of its kind."

Nahee took the tube. It was heavier than it looked. She had the odd, immediate sense that the weight was not in the lacquer but in the number, the ninth, because a ninth implied an eighth, and a seventh, and a long line of people who had stood on cold steps with this tube in their hands. She broke the wax with her thumbnail.

Inside lay a single sheet of heavy paper rolled around a second, thinner sheet. She unrolled the first beneath the lamp at the stair's foot. The script was fine and upright, with the faintly smug precision of people who were never wrong.

*Contract of Sending, Number Nine.*

*Subject: Rennar, Doyun. Classification: wandering soul, hazardous. Location: the old quarter, thirteenth hour only. Method: Tracker's sending, by thread.*

*Term: forty-nine nights from the date of signature. The sending may be performed only on the longest night of the year, the winter solstice, when the hour is at its widest. Attempts before that night are permitted but will not conclude the contract.*

*Consideration: upon completion, Ledger Hall will discharge in full the lien held against the property of Okja, Seon-ja, at the edge of the old quarter, and will compensate the Tracker in addition.*

Nahee read the last paragraph twice, and then a third time, because the first two had not changed what it said.

"How do you know about the house?" Her voice had gone very flat.

"Hall knows the situation of its Trackers," Sul said, and it was not clear whether he meant it as a courtesy or a threat. "The lien falls due at the end of the year. The auction notice has already been drawn up. I understand your grandmother has no other relatives."

"She isn't my grandmother." The correction came out of her by reflex, the way a hand comes up to catch a falling cup. "She's the woman who took me in."

"Forgive me."

She didn't answer. She was looking at the ink. A house with a persimmon tree in the yard, and a kitchen that smelled of nothing at all anymore because Granny forgot to cook. The papers had been sitting on the table for two months and Nahee had been paying down the interest in small, humiliating increments, one sending at a time. The number on the lien was larger than anything she had earned in her life. The number on the contract, she realized, had been left blank, with the word *additional* written above it in the same unhurried hand.

"Eight Trackers before me," she said slowly. "Why did they fail?"

"That is not within the scope of the contract."

"It's within the scope of my life, Mr. Sul. If eight people couldn't send one soul in a city where I can find a lost earring by its owner's grief, I'd like to know what's wrong with the soul."

Sul's careful face did not change. "You will find the subject is not like others. That is all I am authorized to say."

She unrolled the second sheet, mostly to have something to do with her hands.

It was a portrait, drawn in pencil, quick and clean. A man sat in a posture of unhurried patience, one shoulder turned slightly toward the artist, a long dark coat falling open over his knees. His hair was black and a little too long. His face was not remarkable until you reached the eyes, and then it stopped being a drawing of a face and became something much more difficult to put down. He was looking out of the page at whoever held the pencil, and he looked, there was no other word for it, grateful. Grateful to be looked at. As if someone had finally drawn him and he had not expected it to last.

Nahee had seen the faces of the dead for nine years. She knew grief and rage and the exhausted blankness of those who had forgotten their own names. She had never seen a face that thanked her in advance.

"Hazardous," she said, tapping the classification line. "This man is hazardous?"

"The Auditors have classified him so."

"He looks like he'd apologize if you stepped on his foot."

"I am not in a position to comment on his appearance." Sul took a half step back. "You have until sunrise tomorrow to accept. The seal on the lacquer will accept your signature in thread." He bowed again. "Good night, Miss Vael. The bell of the thirteenth hour will have rung by the time you have thought it through. I would not wish you to hurry."

He walked down the lane and the dark folded behind him as though he had never been there.

Nahee stayed where she was for a long time with the paper hanging from her hand. Overhead, the thinness of the hour was already beginning to close, the air thickening, the first sleepy pigeons shifting under the eaves. She tucked the portrait inside her coat, against her chest, where it sat like a second, quieter heartbeat, and started walking.

The house at the edge of the old quarter was small, low, and tiled in black, with a crooked gate that had never closed properly and a persimmon tree that had been there since before the lane had a name. At two in the morning the windows were lit. Granny Okja did not sleep much anymore. She sat up in the front room with the radio turned low and her knitting in her lap, though she had not finished a row in a year.

Nahee slid the gate open with her hip and knocked twice on the doorframe, a habit left over from the first week she had lived here at seven years old, when she had not known if she was allowed to simply walk in.

"It's open, dear," Granny called.

She was sitting in her chair by the stove with a quilt over her knees, her white hair brushed flat, small and straight-backed and bright-eyed. For a moment, as she always did, she looked completely like herself. Then she smiled, and the smile was just slightly too wide.

"Minah! You're back early. Did the school let you out?"

Nahee stopped with one hand on the door.

Minah had been Granny's daughter. Minah had died before Nahee was born. There was a photograph of her on the cabinet, a laughing girl with a scarf around her neck, and Nahee had dusted that frame every Sunday of her childhood.

"It's me, Granny," she said, gently. "It's Nahee."

The smile held for a second, then wavered. Granny's hands tightened on the quilt and her eyes went quickly around the room, touching the stove, the clock, the photograph, as if checking that everything was still where she had left it.

"Nahee," she said. "Of course. Nahee. I knew that." She laughed, a thin and brittle laugh. "I was only half awake. Come sit. I have tea somewhere."

"I'll make it."

She did, in the small kitchen, with her back to the doorway so that Granny would not see her face. The kettle was cold. The tin of brown leaves was in its usual place on the second shelf, behind the rice jar. She measured the leaves carefully, because the tea was the one thing she wanted to do correctly, and while the water heated she let herself look at the table.

The paper was there, under the sugar bowl, where Granny had tried to hide it and where Nahee had found it two months ago. It was printed on cheap, official stock, and the corner of it had been stamped with a red seal. *Notice of Public Sale.* There was a date. It was the end of December.

When she carried the tray out, Granny had gone quiet in her chair, looking at the floor with her hands folded.

"I'm sorry," the old woman said, without looking up. "About the papers. I didn't want you to worry."

"You don't have to be sorry."

"I put them under the bowl. I thought, if she doesn't see them, they won't be real." She breathed out slowly. "Foolish. I know it's foolish. Some days I know exactly what is happening and some days I do not, and I can feel the days where I don't, Nahee, like being underwater. That is what frightens me. Not the house. The house is only a house."

Nahee set down the tray. Her throat hurt.

"It isn't only a house," she said. "It's where I live."

"It's where you grew up."

"It's where I came back to."

Granny looked at her then, properly, her eyes clear for the length of one heartbeat, and put a dry warm palm against Nahee's cheek.

"You always come back," she said. "That's the one thing I never had to teach you. It's the other part that I worry about, the staying."

Nahee didn't know what to say to that. So she poured tea instead, and they drank it in silence while the radio murmured something about river levels, and when Granny began to doze with the cup tilting in her fingers, Nahee took it from her and laid the quilt over her shoulders and sat for a long time on the floor beside the chair.

She made her decision on the front step as the sky was paling. The persimmon tree dripped dew onto the stones. Across the lane a baker was already pulling up his shutters, and the ordinary world was coming in, bread and bicycles and a radio somewhere playing a morning show, and none of it had anything to do with the thirteenth hour.

She unrolled the contract on her knee and read it a fourth time.

The sensible questions arranged themselves in her mind like soldiers. Why would Hall, which had never cared about any individual soul in its ledger, spend eight Trackers on one man? Why a classification of hazardous for a face that thanked you? Why a window of forty-nine nights that could only be closed on one night, when any competent Tracker could send a soul in an hour? Why had they known about the house?

And under the soldiers, quietly, the other question. What did it mean to be the ninth?

She ought to have gone to Barun. Barun had taught her everything she knew about threads and knots and the proper thickness of a patient's silence. He would have turned the contract over in his hands and found the thing she was missing in three sentences. But Barun would also have told her to put it in the stove, and Granny's persimmon tree would be somebody else's tree by New Year's.

So she did not go to Barun.

She took a length of red thread from the roll inside her coat, tied the Tracker's knot, three turns and a tuck, and pressed the knot against the seal at the foot of the page. The paper drank it. The thread vanished into the fibers with a faint sound like a sip, and the heavy ink of the contract settled and darkened, and was still.

Find him, she told herself. Send him. Collect the money. Don't ask the rest.

It was the same thing she had always told herself. It had never failed before.

She slept badly through the morning and badly again through the long yellow afternoon, and when dusk came she was already on the street, boots on the old paving, walking into the quarter with her hands in her pockets and a feeling that the whole district was holding its breath for her.

The old quarter was a hill of crooked lanes, stone steps worn into dishes, tiled roofs stacked on one another like the pages of a book dropped from a great height. By day it was full of tea shops and cheap hotels and old women selling dried fish. By night, after the lamps came on, it grew quiet and a little too deep, as if its alleys went further than they should. At the top of the hill stood the bell tower, and at the bottom, where the lanes drained toward the river, stood the old station, a long low building of dark wood and green tile that had not run a train in twenty years.

Nahee had never liked the station. She had never asked herself why. Trackers learned not to ask why of the places they avoided, because the answer was usually that something there would cost them. She kept to the upper lanes, the ones with the bell tower's shadow across them, and when her walking took her down toward the river she always found some reason to turn aside.

Tonight she stopped at the head of the last stair above the station and stood with the silver ring turning on her thumb.

It was an old ring, thin and plain, too large for any of her other fingers. She had worn it for as long as she could remember, since some night in childhood she never thought about. It had never tarnished. She twisted it now, round and round, and for no reason she could name, a picture came into her mind. A wooden bench. A lantern hanging from a hook. The cold of a stone floor through the soles of small shoes.

She shook her head and the picture scattered.

"No," she said aloud, to nobody.

She took the portrait out instead and held it up to the last of the daylight. The man looked back at her with his patient eyes. His mouth was just beginning to curve, as if he had been told something kind a moment before the artist had begun, and was still keeping it close. The gratitude in his face was somehow worse in the evening, because now she had spent a day with it.

*He's hazardous,* she thought, absurdly. *Of course he is.*

The sun went down behind the ridge. The streetlamps came on one at a time down the lane, and the pigeons settled, and the river began to breathe out its cold. At the very top of the hill the bell tower stirred, a single beam shifting against another, as if the whole building were taking a breath.

Midnight came.

The thirteenth hour opened around her like a hand uncurling. The air thinned. The lamps lost their weight. All across the quarter, faint and amber and silver and blue, the threads of the dead began to rise out of the roofs and chimneys, strand after strand of longing hanging in the dark like a loom strung for some enormous weaving.

Nahee breathed in the copper-and-rain taste of the hour and felt, as she always did, the click of her gift settling into place. There was nothing like it. For an hour every night the city told her what it wanted, and all she had to do was listen.

She closed her eyes, took the thread from her coat, and said the name.

"Doyun Rennar."

She threw it the way she had thrown ten thousand threads, with a flat, clean flick of the wrist, and felt it fly into the dark with the unerring certainty of a stone dropped down a well. In every other case in nine years, it would have struck something. A longing, a wish, a grief, the thread would have found its owner as water finds the lowest ground.

This time it fell slack.

She felt it in her hand first, the loss of tension, the little dead give of a rope that has been cut. She opened her eyes. The thread hung from her fingers and drifted, lightly, in no direction at all. She pulled it back and threw it again, harder, and it sank into the dark and did not so much as tremble.

A third time. A fourth.

The name was there. She could feel the name, the way you can feel a door in a dark room. But the door opened onto nothing. There was no house behind it, no yard, no stairs, no trace of anyone who might ever have stood there. It was a name with no one in it, and the thread dangled from her hand like a line cast into an empty sea.

Nahee Vael had never failed to find anyone.

She stood very still on the stair above the old station, with the silver ring cold on her thumb and the bell tower silent above her, and for the first time in her whole life she understood what it was to look for something and not be answered.