From Grandma Su's recipe book, first page: "Sugar is the easy part. It is the waiting that makes a thing sweet."

The last train to Yunxi left the city at 8:47 in the evening, and by the third stop Su Wenxi had the whole carriage to herself.

She had picked the seat by the window on purpose. A person could look out of a window and appear to be thinking about nothing in particular, while a person staring at her lap looked like someone with something to hide. Her suitcase stood wedged between her knees, one wheel broken since the move, and her tote bag sat on the seat beside her with her phone face down on top of it, like a small animal she did not trust.

She turned the phone over anyway. The email was still there, exactly as it had been for the past nine days.

Dear Ms. Su, it began, in the polite grey font of a company that had rehearsed this message many times. Following the board's decision to cease operations at Aurelle Patisserie Studio, your position as Senior Cake Designer will end effective immediately. Please return all company equipment. Please accept our sincere thanks for your contributions. Her name had been spelled correctly, which somehow made it worse.

Seven years. She had given Aurelle seven years of sugar flowers and five-tier wedding cakes and three a.m. deliveries to hotel ballrooms, and in return the company had given her a title, a decent salary, and a cardboard box to carry her things out in. The box had been too small. She had noticed that, standing on the pavement outside the building with her favourite offset spatula sticking out of the top, and she had thought with strange clarity: they could at least have found a bigger box.

She locked the screen. Outside, the city had finally run out, and the dark pressed up against the window, dotted with the occasional farmhouse light and the grey gleam of paddies flooded for the season.

"I'm fine," she said to the glass, very quietly.

The woman in the window looked back at her, tired around the eyes, hair coming loose from its tie.

"I'm great, actually. Work was getting a bit much, so I'm taking a break. I thought I'd help Grandma with the shop for a while." She tilted her head and tried a smile. The dimple on her left cheek appeared right on schedule. "Isn't that nice? Everything's fine."

The woman in the window smiled back, bright and convincing, and Wenxi felt something in her chest go quietly sour. It was a good smile. She had been practising it for nine days. She had used it on her landlord, on her old colleagues, on the barista who asked how her day was going. She had not yet used it on anyone who had known her since she was small enough to hide inside a flour sack, and she suspected that would be a different test entirely.

The train rocked around a long bend. Somewhere ahead, past the paddies and the low hills, lay a town where nobody would ask her what she was working on these days.

Or rather, a town where everybody would, with great kindness, all at once.

She leaned her forehead against the cool window and closed her eyes, and she did not open them again until the conductor announced, in a voice flattened by decades of repetition, that the next and final stop was Yunxi.

The station at Yunxi was barely a station at all. It had one platform, one wooden bench, and a ticket window that had been shuttered since before she left. A single bulb buzzed over the name board, drawing a small cloud of moths, and beyond the low fence the air smelled of wet stone and duckweed and woodsmoke from some kitchen that had not yet gone to bed.

Wenxi dragged her suitcase down the steps, and the broken wheel announced her to the whole sleeping countryside.

There were no taxis in Yunxi. There never had been. The town sat on a lattice of canals so old that the streets had simply grown around them, and the only road in was a path of worn bluestone that ended at a small stone jetty, where three or four wupeng boats nosed against the steps like patient ducks. Two of them were dark and empty. In the third, an old man sat on the stern with a bamboo hat tipped over his eyes and a thermos of tea balanced on his knee.

"Excuse me," she said. "Are you still taking passengers?"

The hat lifted. Under it was a face like a walnut, brown and creased and entirely unsurprised. He looked at her for a long moment, then at the suitcase, then at her again.

"Su Ji's girl," he said.

Wenxi blinked. "Uncle Ma?"

"Little Xi." He said it the way one might read the name of a station off a very old timetable. "I'll be. I said to myself, Ma, that walk is a Su walk. Head down, like she's late for a delivery. Get in, get in. Mind the suitcase, it's a poor excuse for a suitcase."

"The wheel is broken."

"I heard." He took her case in both hands, set it on the boards as if it were something precious, and offered her an arm to step down. "You've come back to cheer your grandmother up, then. Good. Good girl. She'll be glad."

There it was. The first test, delivered in the first thirty seconds, before she had even sat down.

Wenxi stepped into the boat, sat on the low bench under the woven canopy, and let the smile come up like a well-oiled shutter. "I just thought it was time for a visit. Work has been so busy. It's good to take a break."

"Mm." Uncle Ma pushed the pole against the jetty, and the boat slid out onto the black water without a sound. "A break. Well. Everyone needs one."

He did not say anything else, and she was grateful, and she was also very slightly afraid that he already knew.

The canal took them into the heart of town, and Yunxi unfolded around her the way it always had, slowly and without apology. White walls rose straight out of the water, streaked grey where a century of damp had left its signature, and above them the tiled roofs lay in overlapping waves, dark and glossy under the moon. Window shutters stood half open. A radio murmured an opera in someone's back room. Strings of washing hung between balconies, pale shapes swaying like patient ghosts.

She had thought she would feel nothing. She had spent eight years teaching herself to feel nothing about this place, and the lessons had mostly stuck. Instead she felt the whole town press against her ribs all at once, familiar as her own handwriting.

Then the boat slipped into the long shadow of Liu Bridge, and she stopped breathing.

It was the same stone bridge, a single high arch, its steps worn into shallow dishes by centuries of feet. And at its eastern end, leaning over the water exactly as it had when she was six years old, stood the willow. The branches hung down in long green curtains, stirring faintly. The trunk was thick and deeply furrowed, and on the side facing the canal, at the height of a child, then a taller child, then a girl nearly grown, there were notches.

She knew every one. A line for each birthday, cut with the point of a carpenter's knife, because the boy next door was the only person in Yunxi who was allowed to touch the good knife. His marks climbed up the bark on the left. Hers climbed on the right, always a little lower, always a little crooked, and for years they had quarrelled about it. You're standing on your toes, he used to say. I am not. Stand flat. I'm standing flat, you're just growing too fast. She had been seventeen the last time they measured, and she had been, by exactly one finger's width, still shorter.

Wenxi fixed her eyes on the back of Uncle Ma's bamboo hat and did not look at the tree.

She looked at the weave of the hat. It was a very good hat. Each strip of bamboo had been split fine and laid over and under its neighbour in a pattern as regular as a stitched hem, and she studied it so closely that she could have drawn it from memory. The boat passed under the arch. The willow branches brushed the canopy with a sound like someone whispering. She counted the strips in the hat, and then, when she lost count, she began again.

"Your grandmother's not been well, you know," Uncle Ma said, when they were out from under the bridge and the darkness had thinned again.

Wenxi's head snapped up. "She's not sick? She said on the phone that she was fine."

"Not sick, no. Not that way. It's the house." He tapped the pole against the canal wall to turn them into a narrower channel. "The roof on Su Ji won't see another rainy season. Everybody on the street knows it. Every spring it gets worse, and every spring she says it's only a little drip, only a little drip, and puts out another bucket. Seventy-four years old. I told her, Hui, you'll catch your death. She said, then I'll catch it with dry feet, and she went back to her dough."

That sounded exactly like Grandma. Wenxi pressed her lips together and discovered, to her annoyance, that her eyes had begun to sting.

"Nobody's helping her with it?"

"Oh, somebody's helping." There was a smile in the old man's voice now, though he kept his face turned forward. "Young Gu. That carpenter boy from next door. Comes by every day, up and down that ladder, checking tiles. Never says a word about it. Your grandmother pretends she doesn't notice, and he pretends he's only passing, and between the two of them it's the most dishonest thing I've seen on this canal in forty years."

Wenxi's hands had folded themselves very neatly in her lap. She watched them do it.

"That's so kind of him," she said, and her voice came out a full half-tone too bright, ringing off the canal walls like a spoon on a glass. "He was always a good neighbour. I should thank him."

"Mm," said Uncle Ma.

It was a very small sound, the sort an old man makes when he is being polite about a lie, and it followed her all the way to the jetty.

He would not take money. She tried twice, and the second time he pushed the notes back into her hand and told her to buy her grandmother something sweet instead, and before she could argue he had set the suitcase on the steps, tipped his hat, and pushed away into the dark.

Su Ji stood at the end of Sixth Alley, where the bluestone narrowed so much that two people carrying baskets had to turn sideways to pass. Wenxi dragged her suitcase down it, and every wheel-rattle echoed off the walls like a small avalanche. A cat watched her from a windowsill. Somewhere a baby fretted and was hushed.

The shop had not changed, or rather it had changed in the way a face changes when you have not seen it for years: the same, only more so. The whitewashed wall had gone the colour of weak tea. The wooden shutters, once a cheerful red, had weathered to the shade of old brick. Above the door hung the sign, a long board of dark wood with the shop's name picked out in gold leaf, and the gold had worn away from the edges inward, so that SU JI now looked as if it were slowly being swallowed by the wood around it.

The door was locked. Of course it was locked. It was past ten, and Grandma went to bed with the chickens.

Wenxi crouched beside the third flowerpot from the left, a chipped blue one holding a stubborn clump of mint, and tipped it forward. The key was where it had always been, cold and slightly gritty with soil. Eight years, and the hiding place had not moved an inch. Nobody had even thought to be careful.

She stayed there on her heels with the key in her palm.

The alley smelled of mint and old damp stone, and underneath it, drifting faintly through the shutter slats, of flour and sugar and something warm that she could not name and did not need to. It was the smell of every morning of her childhood. It went into her like a hand into a glove, and for the first time since the pavement and the cardboard box and the offset spatula, her throat closed up completely.

Not here, she told herself. Not on the doorstep. You can fall apart after you've found the bathroom.

She stood, pressed the heel of her hand hard against each eye in turn, and fitted the key into the lock.

Above her head, something scraped.

It was a small sound, tile against tile, then the whisper of a heavy sheet dragged across a slope. Wenxi froze with the key half turned. The scrape came again, then a soft thud, then silence, then another scrape.

A cat, she told herself. A very large cat.

She let herself in.

The front room was dark and cool and exactly as she remembered it, the old glass counter, the shelves of wooden moulds, the low stools around the tea table. She drew her suitcase in after her, shut the door as quietly as she could, and stood listening. Grandma's snore came faintly from the back, slow and steady, a sound that had lulled her to sleep through more thunderstorms than she could count.

In the kitchen she set her bag on the table and sat down on a stool that had been repaired so many times its legs no longer matched. Her phone was warm in her hand. There were four unread messages from Bai Ning, her former flatmate and the only person in the city who knew the whole story.

Did you get on the train?

Are you there yet??

Did you tell your grandma?

Please tell me you're not going to pretend everything's fine for the next six months.

Wenxi began to type. Honestly, I don't know what I'm doing, she wrote, and looked at it, and deleted it letter by letter. She typed, I'm scared that I'm not as good as I thought, and deleted that more quickly. She typed, I'm okay!!, and the double exclamation marks looked so desperately cheerful that she erased them too.

The cursor blinked in the empty box.

The trouble was that the truth, once told, would have to be lived in. Bai Ning would worry. Grandma would worry. The whole street would worry, with casseroles and advice and hands patting her shoulder. And somewhere in that careful kindness there would be a look, a very small look, the one people give when they realise that the bright girl who left town to become somebody has come home with nothing to show for it. She had spent eight years earning her way out of that look. She would rather carry the lie up the stairs one step at a time than let anyone see her face when it fell.

She set the phone face down on the table.

I'll tell them later, she decided. When things are fixed. When the shop is back on its feet and I have a plan and a reason. When it doesn't count as failing, it counts as a detour.

Outside, the scraping came again, louder, followed by a dull thump and a very quiet, very human exhalation.

Wenxi's head came up.

That was not a cat.

She crossed the kitchen, unbolted the back door, and stepped out into the courtyard.

It was a small square of old flagstones, bordered by a low wall and a jasmine in a stone pot, with one corner given over to a rain barrel and a tangle of clothes lines. The moon had come out over the rooftops, round and white and rather too bright. In its light she could see every tile of the long grey roof above her, and every dark patch where the damp had crept into the wood.

And on the ridge of that roof, crouched low with one knee braced against the slope and a heavy blue tarpaulin dragged half across the tiles, there was a man.

He had his back to her. His sleeves were pushed to the elbow. A rope was clamped between his teeth, and both his hands were busy hauling the edge of the tarp up and over a broken section of rafter, and he moved with the unhurried economy of someone who had done this so many times that he no longer needed to think about it.

She knew him by his shoulders.

It was ridiculous. Eight years, and a different haircut, and a body that had broadened and hardened in ways she had not been there to watch. But the shoulders were the same, set a little forward, as if bracing against a wind nobody else could feel. They were the shoulders of a boy who had carried her through two floods and a thousand arguments about whose turn it was to hold the ladder.

Gu Chengyan.

Her heart did something stupid and violent, a single hard knock against her ribs, as if it had been waiting all evening for permission.

He must have felt her gaze. His hands stilled. For a long moment he did not move at all, and the whole courtyard seemed to hold its breath with her, the jasmine, the rain barrel, the moon. Then he took the rope out of his mouth, slowly, and turned his head.

The moonlight caught the line of his jaw, which was sharper than she remembered, and the dark straight brows, and his eyes. They had always been the darkest eyes in Yunxi, and in the dim they looked black. They found her at once, as though he had known exactly where in the courtyard to look.

Neither of them spoke.

She had rehearsed this. Somewhere in the long hours of the train, between the email and the window, she had imagined the moment she saw him again, and every version had been smooth and bright. She had been casual. She had been warm. She had made a joke about his hair. Now her mouth had gone completely dry, and every sentence she had prepared lay somewhere at the bottom of her, impossible to reach.

Eight years, said the silence. Eight years and one box of pastries on your doorstep.

Chengyan looked down at her from the roof, and his face did not change. There was no surprise in it, no softening, no anger either, only a stillness so deliberate that it was almost louder than shouting. The rope hung from his fist. A little breeze moved the jasmine.

Then he spoke, in the low, even voice that she would have known in her sleep, and it was so ordinary that it nearly undid her.

"The roof has been leaking since March."

Wenxi opened her mouth. Nothing came out.

"Don't stand there," he said.

She looked down. She was standing on the flagstone beside the jasmine pot, the one with the small chip in its corner, the one exactly under the worst of the damp, where a slow cold drop of water fell from the broken eave, once every few seconds, onto the stone beside her left foot. She had stood in that spot every evening of her childhood, shelling peas, doing homework, waiting for bread to rise. She had never once thought about why. It had simply been her place.

He knew that. Of course he knew that.

A single drop landed on the flagstone with a small, clear sound.

She stepped aside, one pace to the left, and the silence rearranged itself around the movement. Chengyan nodded once, as if that settled something, put the rope back between his teeth, and turned back to the tarp, and in a moment the quiet rasp of canvas over tile began again, steady and unhurried, as though nothing in the world had happened.

Wenxi stood in the moonlit courtyard with her hands clenched at her sides and her face burning, and discovered that she had absolutely no idea how to be fine.