Prologue

The first coat lifted off its peg at ten minutes past four, which was a terrible time for a coat to develop opinions. It was Mrs Hegarty's yellow raincoat, the one with two pockets full of old receipts and one sleeve that smelt faintly of peppermint creams. It rose slowly, as if trying not to be noticed, and bumped its hood against the ceiling of St Brigid Community Hall.

Nobody screamed at first. Emerald Harbour people liked to gather evidence before making a show of themselves. They stared up at the raincoat while the kettle whistled in the kitchen and the raffle tickets fluttered on the trestle table. Then the yellow raincoat sneezed, dropped three crumbs from its pocket, and drifted towards the open window.

'Well,' said Granny Nuala Breac, who had taught three generations of children not to lick paint, insult nuns, or panic before supper. 'That's new.'

Clodagh Kelleher had been kneeling under the cloakroom bench, looking for the missing silver button from her school coat. She had mud on one knee, biscuit dust on her chin, and a feeling in her stomach that was halfway between adventure and being blamed for something she had only partly done. When the raincoat floated past her head, she grabbed its hem without thinking.

The coat tugged. Clodagh tugged back. The coat had the advantage of being airborne, but Clodagh had the advantage of being stubborn. The yellow raincoat made a damp little squeak and dragged her two inches across the floor.

'Clodagh, love,' called Granny, 'kindly stop wrestling Mrs Hegarty's outerwear.'

'It started it,' Clodagh said, which was accurate, if not especially helpful.

By then the hall had noticed that the yellow coat was not working alone. A navy duffel rose from beside the radiator. A green anorak shivered itself awake on a hook. Six school jackets puffed like pigeons and bumped into one another over the piano. Mr Quinn's respectable brown overcoat twitched, hesitated, and then shot straight up as if late for Mass.

Before the coats rose, Clodagh had believed the evening's worst disaster would be singing second verse instead of first. Ferry Road School had practised The Little Boat of Emerald Harbour for two weeks, and every rehearsal had proved that twenty-one children could begin together and still arrive at the chorus like passengers falling off different buses. Clodagh had been given the small triangle because Mrs Byrne said she had excellent timing. Aidan O'Rourke said it was because the triangle had only one note and even Clodagh could not argue with it. Clodagh had argued with him for six minutes, which rather proved Mrs Byrne's point about timing.

The hall had worn its proper community face that afternoon. Long tables had been covered in paper cloths. The good mugs had come out, though two were chipped and one announced BEST GRANDAD to anyone brave enough to drink tea from it. In the corner, beside the charity basket, Granny had arranged three biscuit tins of buttons: brown for sensible coats, black for funerals and school blazers, bright colours for children, pearl for people who liked to pretend they were not fancy. Clodagh had been in charge of the bright tin, a responsibility she had accepted with solemnity and one accidental mint humbug.

People came in with their coats folded over their arms, carrying small worries with them. Mrs Hegarty needed a button sewn on before her bus to Ballymore. Mr Quinn had two loose ones and a speech prepared about modern thread. The twins from North Quay Clinic brought a pram suit with frog buttons, one missing eye, and their baby brother, who tried to eat the raffle tickets. Clodagh watched Granny greet each person, not with fuss, but with attention. Granny could make a person feel mended before the sewing started.

That was why the change in Granny's face frightened Clodagh more than the floating coats. Coats could be pulled down. Faces could not always be put back the same way. When Granny saw the silver button, the room inside her seemed to open, showing a corridor Clodagh had never been allowed down. In that corridor were things with old dust on them: promises, boxes, maybe names. Children were often told they were too young for such corridors, but somehow the doors opened around them anyway.

Mara had been tired before the trouble began. Clodagh had noticed because Mum had rubbed the place between her eyebrows three times and forgotten to drink her tea while it was hot. Mara worked at the community office, which meant people brought her problems wrapped in politeness and expected her to unwrap them without tearing anything. She had spent the afternoon arguing with Tadhg Mercer from the Harbour Records Office about missing grant forms. She had come to the supper with a stack of labels, a red pen, and the expression of someone who had already had quite enough civic spirit for one day.

Cillian had arrived late with a toolbox and a paper bag of currant buns. He was not family exactly, though he had fixed Granny's window latch, Mum's bicycle brake, and Clodagh's scooter bell, so he belonged to the category of people a house trusted. He teased Mara in a careful way, the way someone tapped a door before entering. Mara pretended it annoyed her. Clodagh suspected it did not annoy her nearly enough.

The broken teacup had sat quietly on the sill through all of this, holding its silver buttons as if holding its breath. It was white china with a blue flower inside the rim, the kind of cup adults called too good for everyday and then forgot in cupboards until everyday became impossible without it. The chip on the lip was Clodagh's fault. The gold line that appeared later was not, though she was willing to be blamed for it if blame came with answers.

When the first click sounded from the cup, Clodagh thought a button had cracked. When the second click came, she thought of teeth. By the third, she understood that the cup was not breaking further. It was waking. That was a different sort of danger: the kind that had been pretending to be an object because people are less suspicious of crockery.

The silver button had not looked magical at first. It had looked lost. That was the clever disguise of many important things. It had a dent on one side, a polished rim, and four neat holes like tiny windows. Clodagh could imagine it on a very serious coat belonging to someone who stood in doorways and said, 'We shall see.' She could not imagine why it had chosen her shoe to roll against, unless buttons, like cats, preferred people who were busy doing something else.

While the grown-ups argued, Clodagh noticed other small wrongnesses. The raffle tickets arranged themselves into rows of seven. The bunting stopped spelling WELCOME and began, very slowly, to spell WELCLOAK, which was either a clue or poor spelling under pressure. The old piano played one tiny note whenever a coat sleeve lifted. Nobody else seemed to hear it. Adults missed music when they were busy being reasonable.

The hall's side door opened once, without anyone touching it. Cold air slid in, smelling of salt, coal smoke, and Granny's lavender drawer paper. At the threshold stood no person, only a shadow shaped like a child in a red coat. Clodagh saw it because she was under the bench. The shadow raised one hand, touched the place where a top button should have been, and vanished before she could call out. Later, she would wish she had shouted. But shouting about shadows at community suppers was the sort of thing that got a person sent to sit beside Mr Quinn.

So when the button spoke, some part of Clodagh had already been waiting. Not the sensible part. The sensible part was still listing explanations: vent, trick, school projector, mass hallucination caused by egg sandwiches. But another part of her, the part that remembered Granny's dresser humming at midnight and Mum going quiet whenever the pantry wall knocked, thought: finally. The house had been clearing its throat for years. Tonight, it had chosen words.

A child can live beside a secret for a long time without knowing its name. She feels it in pauses, in drawers shut too quickly, in birthdays skipped over, in old photographs turned face down before visitors come. Clodagh had felt one in Granny's house. She had thought perhaps all families had rooms where conversation changed its shoes before entering. Now she knew her family's room had rails.

The coats continued to rise by inches, polite but determined, and the people of Emerald Harbour began to show who they were when warmth threatened to leave. Mrs Hegarty grabbed three coats that were not hers because she had long arms and a generous temper. Mr Quinn protected his own first, then looked ashamed and caught the baby's frog pram suit. Aoibhe Byrne from The Echo Ledger took photographs until Mara told her that if one picture appeared before the coats landed, she would personally staple Aoibhe's notebook to a chair. Aoibhe lowered the camera but kept looking, which journalists did when the world handed them a door.

Tadhg Mercer was not there. That mattered later. It mattered because Tadhg never missed a public event where he might be thanked into a microphone. It mattered because the charity ledger had been promised from his office that morning and had not arrived. It mattered because the silver button clicked whenever his name was spoken, even before anyone understood that buttons could have opinions about men in polished shoes.

By the time the teacup rang the third time, Clodagh had decided three things. First, magic was rude. Second, grown-ups were frightened of old promises in a way children were not, because children had fewer old promises stacked behind them. Third, if the town's coats flew away, everyone would be cold, and being cold made people cross, and cross people blamed the easiest person, which was often a child, a granny, or whoever had last touched the biscuit tin.

That was why she held the cup when Granny gave it to her. Not because she was fearless. Fearless people, in Clodagh's opinion, had probably not imagined enough consequences. She held it because the cup was broken and still useful, because the button was bossy and perhaps right, because Mum's hand was shaking though Mum had hidden it in her pocket, and because a child in a red coat had stood in the doorway with a missing button no one else had seen.

The Button Night Supper had been planned as a simple thing: tea, sandwiches, a small concert by Ferry Road School, and a charity basket for replacing the missing buttons on the winter coats of families who needed them. Granny said every useful town had one night a year when people admitted that life wore through the seams. Buttons were small, she said, but so were kindnesses, and nobody complained when enough of them held a coat closed.

Clodagh had liked that. She liked useful things. She liked boxes sorted by colour, lists with neat ticks, and buttons that knew their place. She did not like coats deciding to become birds.

'Close the windows!' shouted Mara Kelleher, Clodagh's mother, from the tea table. Mara could make any instruction sound as if it had already been obeyed by sensible people. She caught the hem of the navy duffel with one hand and the plate of egg sandwiches with the other, saving both, which was the sort of thing mothers did when they had no time to be impressed with themselves.

Cillian Struan, who owned the repair shop on Ferry Road and could mend anything except his own handwriting, blocked the main door with a folding chair. 'If anyone has a spare belt, scarf, skipping rope, or dramatic sense of timing, now would be handy.'

Three aunties offered scarves. Two children offered skipping ropes. Mr Quinn offered advice. Nobody wanted that.

The hall filled with flapping sleeves and startled voices. Coats knocked bunting from the rafters. A red scarf unwound itself from a chair and slithered after a tweed jacket like a loyal snake. On the windowsill, Clodagh's broken teacup rattled in its saucer.

That teacup was important. It had come from Granny's dresser, the tall blue one in the back bedroom with painted roses on its doors and a wobble in the left foot. Clodagh had chipped the cup that morning while trying to prove she could carry tea and three library books at once. Granny had not scolded her. She had turned the chip towards the light and said, 'A cup can lose a piece and still know how to hold warmth.'

Clodagh had pretended not to care, because pretending not to care was sometimes easier than saying sorry properly. She had carried the cup to the hall anyway, filled it with spare silver buttons, and set it on the sill where everyone could take one if they needed. Now the cup trembled so hard its saucer clicked like teeth.

Click. Click. Click.

The missing button from Clodagh's coat rolled out from beneath the bench and stopped against her shoe. It was bright silver, shaped like a tiny wheel, and it had not been there a moment before. Clodagh knew because she had searched under the bench twice, and she was the sort of person who counted searches.

The button rocked once. Then it spoke.

'Platform behind the dresser,' it squeaked. 'Passenger late. Cargo missing. Bedtime deadline approaching.'

Clodagh stared at it. The hall roared around her: coats flapping, grown-ups grabbing, a kettle shrieking, Mr Quinn saying again that in his day coats had more respect. The silver button sat by her toe with the calm of someone who had delivered bad news professionally.

'You're a button,' Clodagh whispered.

'And you're observant. Excellent. We may survive.'

Clodagh glanced at Granny. Granny had pinned Mrs Hegarty's raincoat beneath one sensible shoe and was tying the sleeve of the green anorak to the piano leg. She looked less surprised than a granny ought to look when clothing went airborne.

'Granny?' Clodagh called.

Granny turned. For one small second, her face changed. Not frightened exactly. Remembering. That was worse. Adults were always hiding things in remembering.

The silver button hopped onto Clodagh's palm. It was warm, as if it had been kept in someone's pocket. Around its rim, in letters so tiny she had to squint, were the words RETURN BEFORE BEDTIME.

'Is this yours?' Clodagh asked Granny.

'No,' Granny said. Too quickly. Then she added, 'Not anymore.'

Mara heard that. Mothers heard everything, especially things not meant for them. 'Mam?'

But another coat made a break for the window, and Cillian lunged, and the hall became a storm of wool and sleeves. Clodagh closed her fist around the button. In that tiny dark cave of her hand, the button beat like a heart.

'Behind the dresser,' it said again, muffled now. 'The Teacup Train leaves when the chipped cup rings thrice.'

The cup on the windowsill rang once.

Every coat in the hall froze mid-flap.

It rang twice.

Granny looked at Clodagh, and the look said many things at once: don't go, do go, I'm sorry, be brave, and for heaven's sake take a cardigan.

It rang a third time.

The coats dropped. All of them. They fell from the ceiling in a woolly rain, burying Mr Quinn to the eyebrows and covering the raffle basket. The hall went silent except for the kettle, which had finally given up shrieking and settled into a sulk.

Clodagh opened her hand. The silver button glowed blue at the edges.

'Passenger confirmed,' it said. 'All lost buttons must be delivered before bedtime, or every coat in Emerald Harbour will float away for good.'

Nobody laughed. Not even Cillian, who usually laughed first and explained later.

Mara crossed the hall and knelt in front of Clodagh. 'Tell me exactly what just happened.'

Clodagh looked at her mother, then at Granny, then at the chipped teacup shining on the sill. She wanted to say she knew nothing. She wanted to give the button to an adult and let them fix the problem while she ate a sandwich and became ordinary again. But the button had chosen her palm. The cup had rung for her. And somewhere behind Granny's dresser, a train small enough for a teacup was waiting.

'I think,' Clodagh said carefully, 'my coat has lost something important.'

The silver button corrected her in a voice like a pin dropping into a jar. 'Not your coat. The town.'

That was how the Button Night Supper became the night Emerald Harbour nearly lost its sleeves. It was also how Clodagh Kelleher learned that some family secrets were not kept in locked boxes or dusty envelopes. Some waited behind dressers, polished their rails, and whistled at exactly the wrong moment.

Granny lifted the chipped cup from the sill. There was a hairline crack down its side now, shining gold where there had been plain white china. From inside came a sound Clodagh had never heard before but knew at once: a tiny engine clearing its throat.

'Nuala,' Mara said, and her voice was low in the way that meant a storm was being folded into a sentence. 'What is behind your dresser?'

Granny closed her fingers around the cup. 'A promise I should have kept better.'

Clodagh's stomach dipped. Promises were worse than rules. Rules could be argued with. Promises followed you.

Cillian picked a sleeve from his shoulder and looked from Granny to Mara to Clodagh. 'I'm going to ask the foolish question because apparently no one else has the courage.'

'Don't,' Granny said.

'Is there,' he asked anyway, 'a train in your bedroom?'

The chipped cup gave a very small whistle.

Granny sighed. 'Not in the bedroom, precisely.'

The hall erupted, but Clodagh heard only the silver button on her palm, whispering the timetable in a language made of clicks. Three stops before supper. Seven lost buttons. One wrong delivery and the coats rise. Return before the last lamp is lit. No grown-up passengers without a child to vouch for them.

'Why me?' Clodagh asked.

The button tilted, considering. 'Because you noticed what was missing.'

That felt unfair. Clodagh noticed lots of things. Loose threads. Mum's tired eyes. Granny's letters hidden under the flour tin. The way adults changed the subject when the old blue dresser was mentioned. Noticing was not the same as volunteering.

'I didn't say yes.'

'No,' said the button. 'But you picked me up.'

There was the trouble with stories. They were always deciding the first step had counted before you knew there was a road.

Mara took Clodagh's free hand. 'Nobody is going anywhere until I understand.'

The chipped cup rang again, softer this time. A warning, not an invitation. Around the hall, every coat sleeve lifted one inch from the floor.

Granny's mouth pressed thin. 'Understanding may have to jog to keep up.'

Clodagh had never seen her mother look at Granny that way: hurt and angry and scared, all neatly folded like washing no one wanted to put away. She had never seen Granny look small. But she did now. Not weak. Never that. Small in the way a person looked when an old mistake had grown bigger than the room.

The button warmed in Clodagh's hand. The coat sleeves lifted another inch.

'Fine,' Mara said. 'We go together.'

'Children only for the first mile,' said the button.

'Absolutely not,' Mara said.

'Ticket law,' said the button, which sounded annoyingly official.

'I don't care if it is stitched into the moon.'

'Mum,' Clodagh said, surprising herself. 'If I don't go, the coats fly away.'

'Then let them. We will buy jumpers.'

'For the whole town?'

Mara opened her mouth. Closed it. Clodagh could see the calculation arrive: money, neighbours, winter, old people waiting at bus stops, small children with sleeves too short already. Her mother hated being cornered by practical truth. It was one of the few things that could stop her mid-sentence.

Granny set the chipped cup into Clodagh's other hand. 'You take this. Keep the crack turned towards you. It will show the way when the rails vanish.'

'Rails vanish?' Clodagh said.

'Only where the story gets shy.'

'That is not comforting.'

'Most true things aren't at first.'

Mara stood so quickly the nearest coats flinched. 'No. I am not sending my daughter behind furniture with a talking button and a cracked cup because the town forgot how to sew.'

The silver button clicked. 'Correction: the town forgot what it owed.'

Granny shut her eyes.

There it was: the private wound under the public mess. Clodagh could feel it like a loose floorboard. She did not know what Emerald Harbour owed, or who had kept count, or why her granny's dresser had a railway behind it. But she knew this: when grown-ups used words like owed, promise, and not anymore, children were about to inherit a problem wearing a very serious hat.

The hall lights flickered. Outside, along Ferry Road, a line of coat sleeves lifted in shop windows, on prams, in porchways. Through the glass, Clodagh saw Mr Struan's repair-shop sign swing without wind. A school blazer pressed itself flat against a lamppost, trying to climb.

People gasped. Someone began to pray. Someone else began to count coats. Mr Quinn, still under Mrs Hegarty's raincoat, muttered that he had always distrusted charity suppers.

Clodagh looked at the teacup. The gold crack glimmered like a tiny track. At the bottom, beneath the buttons, a red light appeared. Then a green one. Then a puff of steam no bigger than a dandelion seed.

'Passenger,' said the button, 'choose.'

The word choose made Clodagh angry. It sounded grand, as if she were standing on a cliff with a sword. Really, she was eight years old, hungry, and missing the button from her coat. She wanted Mum to fix it. She wanted Granny to explain. She wanted the coats to behave and the hall to smell of buns again.

But the sleeves outside rose higher.

Clodagh closed her fingers around the chipped cup. 'Where do I deliver the buttons?'

The silver button shone bright enough to paint her knuckles blue. 'To the pockets that lost them. To the promises that dropped them. To the doors that were closed too early.'

'That's not an address.'

'No,' said the button. 'It is a route.'

Cillian gave a little nod, as if that made railway sense. Mara did not nod at all.

Granny took a green ribbon from her sleeve and tied it around Clodagh's wrist. 'So I can find you if the train forgets your name.'

'Trains can do that?'

'Only rude ones.'

'Is this one rude?'

From inside the cup came a toot that sounded offended.

Despite everything, Clodagh smiled. A very small smile, but hers. The kind of smile that slipped out before fear could lock the door.

Mara crouched again and cupped Clodagh's face. 'You listen to me. Brave does not mean silent. Clever does not mean alone. If anything tells you a child should manage grown-up secrets without help, you kick it in the timetable.'

'Mara,' Granny said.

'No, Mam. That rule stands.'

Clodagh nodded. 'Kick timetable if necessary.'

'Good girl.' Mara kissed her forehead, quick and fierce. 'And you come back before bedtime.'

The button clicked. 'That is, in fact, the entire point.'

'Nobody likes a smug haberdashery item,' Cillian told it.

The chipped cup rang once more. Behind Granny's blue dresser, far across town and impossibly close, rails began to sing.

Clodagh felt the sound in her shoes. It ran up through her bones, bright and tinny and urgent. She thought of every coat in Emerald Harbour floating away: babies' pram suits, fishermen's oilskins, school jackets, Granny's good black coat with the shiny elbows, Mum's red scarf that smelled of rain and hand cream. She thought of buttons as tiny promises, each one saying I will hold this closed until you are ready to open it.

Then she looked at the silver button, the broken cup, and the adults who loved her but could not agree how to save her from the story already waiting.

'All right,' she said. 'But I am not missing pudding.'

The teacup train whistled again, delighted and impatient.

And all across Emerald Harbour, the coats rose another inch.