Gemma Silvestre had collected a gem from every corner of the realm, and now the last one sat on her workbench, trying to kill her. The Mirrorstone would be the first lesson in her new jewel-cutting school, the one she meant to build in Birchrot. But a crust of gray Gloomcap coated the stone. One touch of the poison with bare skin, and her teaching days were over before they began. She wore thick gloves and held the stone over a shallow dish. The gray layer clung like dried mud. She scraped it with a steel pick. Flakes drifted down. One landed on her glove and hissed, eating a small hole in the leather. Gemma set the pick down. Steel alone would not do this. She needed someone who knew poison. She found Dr. May Goldstein at her clinic, a panda in a lab coat, gold bangles stacked up one arm. Each bangle marked a patient she had saved. Gemma trusted that record. She set the covered stone on the exam table. "Gloomcap," May said. She did not touch it. "Nasty. I've pulled it out of three animals." She tapped one bangle. "Two lived." "I need it off the stone," Gemma said. "Clean. The gem underneath must survive." May studied the crust. "Gloomcap hates salt brine. Soak it, the poison lifts. The brine has to be strong." The clinic door swung open. Sable walked in without knocking, a wiry girl with a sling on her hip. She and Gemma had traded hard favors before. Sable owed her nothing now, which was exactly why she came. "Heard you needed salt," Sable said. She dropped a weathered tin on the table. Salted eel, packed tight, glossy strips buried in white crystals. "Fishing quarter's strongest cure. Take the brine. Keep the eel." May cracked the tin and poured the salty liquid into a glass jar. Gemma lowered the Mirrorstone in with her gloved hand. The brine turned cloudy at once. Gray threads rose off the stone and curled through the liquid like smoke. The three of them watched. Nobody breathed over the jar. An hour passed. May lifted the stone with iron tongs and rinsed it under running water. The Gloomcap sloughed away in sheets. Underneath, the gem shone clear and smooth. At its center, a true mirror held Gemma's own face, sharp and bright. "Clean," May said. "Touch it. It won't bite now." Gemma peeled off one glove. She pressed a bare fingertip to the stone. Nothing burned. The mirror surface stayed cool. She had her masterwork at last, the centerpiece of her school. Then her reflection moved. Gemma held still, but the face in the mirror turned its head. It looked past her shoulder, at the door behind them, as if watching for someone coming. Gemma spun around. The doorway stood empty. "May," she said quietly, "whose reflection is that?"

The Mirrorstone sat on Gemma's workbench, wrapped in a cloth. For three days she had refused to look at it. The face inside still moved on its own. It turned, it searched, it watched doors she had not opened. She could not hang such a stone in her school. Students would see it and run. She needed to know what the face wanted before the gem could teach anyone. She unwrapped it at dawn and watched. The face pressed close, as if against glass. Its mouth moved. No sound came. Gemma leaned nearer and studied the shape of the lips. The same two motions, again and again. She had read lips before, with cheating merchants across loud market stalls. She watched until she was sure. The face said: let me out. Gemma set the stone on the sill. Outside, a pink flying hamster darted past the window and landed on the ledge, wings buzzing. It pressed its small paws to the glass and stared at the Mirrorstone. Then it chirped, loud and sharp, and would not stop. The face inside the gem turned toward the sound. For the first time, it smiled. Gemma understood then. The face was not trapped by poison or by magic she could scrape away. It was answering living things. It had watched the door for whoever drew near. It had smiled at the hamster. The stone did not want freedom. It wanted company. It mirrored not her face, but the heart of whatever stood closest. She tested it. She fetched a spotted rabbit from the yard, a bright dancing thing that never held still. She held the stone before it. The face inside began to dance too, loose and glad, matching the rabbit's hops. Then she brought the stone near her own chest and thought of her school, of students bent over gems. The face grew still and careful, eyes narrowed in work. It showed her back to herself. Gemma laughed out loud. This was no curse. This was the finest teaching stone in the realm. A gem that showed each student their own focus, their own joy, their own distraction, in a living mirror. No lecture could do what this stone did in a glance. She polished it clean and fixed it to the center of her dress, the last empty setting filled at last. The face settled into her reflection, calm and steady, matching her resolve. She could use it now. She would open the school. But as she turned from the window, the face in the stone shifted. It looked past her shoulder again, toward the road. Its eyes widened. Its mouth moved, fast now, urgent. Gemma followed its gaze. Far off on the road, a dark carriage rolled toward Birchrot, drawn by pale, bony horses. Someone was coming for the stone. And the stone knew it before she did.

The dark carriage stopped outside Gemma's school at dusk. Pale horses stood still as bone. The Mirrorstone on her dress pulsed cold against her chest. Its face had gone sharp and watchful. Gemma pressed her hand over the stone and stepped out to meet the rider. The rider was a hunched old woman in a moth-eaten velvet coat. Edna Mull. She set a folding table on the grass and opened a ledger thick with names. Gemma knew her from the crossroads. People said Edna traded in debts no one remembered owing. "You hold something that belongs in my book," Edna said. Her smile did not reach her eyes. "The Mirrorstone. I have come to collect." She tapped a blank line in the ledger. "Sign, or give it freely. Either way, I leave with the stone." Gemma did not move. "It is set in my dress. It opens my school. You will not take it." Then the air near the carriage went thin and cold. A flock of ghosts rose from behind it. They drifted up, soft and weightless, their faces wide with fright. They swarmed toward Gemma. She stumbled back against her own door. Steps sounded on the path. A chipmunk mother came fast, skillet in one paw, flour still on her apron. Hazel Acornwood. Behind her walked a tall figure in a navy coat, tentacles trailing on the ground. Captain Chromis Deepwater, the fishing quarter captain. Both had come running at the chill. "Those are hungry things," Hazel said. "Hungry things take. Robbed my acorn tin all autumn. I know the look." She raised the skillet. Chromis studied the ghosts, then the stone. "They mirror," he said. "Fear calls fear. Calm calls calm. Same as any wild thing." Gemma understood at once. The Mirrorstone fed back whatever stood near it. The ghosts were afraid, so they spread fear. She unpinned the stone and held it high. She fixed her mind on her workbench, on steady hands cutting a flawless gem. The face in the stone grew still and sure. The nearest ghost drifted close and stared into the glass. Its wide eyes softened. Its mouth closed. One by one the flock calmed. They sank low and drifted off toward the pond behind the school, quiet now, trailing over the peach-colored rocks like mist. Edna's hands shook. Without her ghosts she had nothing. She snapped the ledger shut. "This is not finished," she said. She folded her table, climbed into the carriage, and the pale horses pulled her into the dark. Gemma pinned the stone back to her dress. "Thank you," she told Hazel and Chromis. "Both of you." Chromis nodded once. "She signs names," he said. "Yours is in her book now, unpaid. She will come back with worse." Gemma looked at the empty road. The stone had saved her. But it had also marked her. Edna knew exactly what the Mirrorstone could do now, and she would not come alone again.

The road stayed empty after Edna's carriage left, but Gemma had a new problem by morning. She had the Mirrorstone pinned to her dress. She had students. Seven of them waited on the grass at dawn, tools in their satchels, ready to learn gem-cutting. She had no walls to put them behind. She had no roof. A school was not a stone. A school was a place, and she had none. She led the students to the chapel, thinking the kind pastor might lend a corner. The cedar doors stood open. Inside, the carved beams glowed, but every bench was full. A choir practiced. Children napped in the pews. There was no room for seven students bent over workbenches. Gemma thanked the quiet and backed out. The Mirrorstone warmed against her chest, catching her worry and throwing it back. That was when the raccoon washerwoman came down the path with a basket on her hip. Rosemary Thornwood washed magical clothing. She had helped move the dragons once, Gemma remembered, slipping heavy things past watchful eyes. Rosemary set down her basket and looked at the students, then at Gemma. "You need a building," Rosemary said. Not a question. "I need walls today," Gemma said. "I have the stone. I have no room." Rosemary wiped her paws on her apron. "There is a house that drifts. Birds carry it on the wind. It lands when the air goes still." She pointed past the chapel, where a pale shape hung low over the fields. A flock of birds held it up. Curved walls, red tiles, a small iron balcony. "Owner left years back. It answers to whoever stands under it when it sets down." Gemma studied the floating house. "How do I bring it down?" "Still air," Rosemary said. "Birds climb on wind. No wind, they rest. House rests too." The wind blew steady across the open grass. Gemma turned to her students. "We make a wall," she said. "A windbreak." They dragged the chapel's spare benches, stacked crates, and a tall laundry line Rosemary strung with wet sheets. The sheets caught the gusts and held them. Behind the barrier the air fell dead and quiet. The flock above tired. One by one the birds folded their wings and perched along the red tiles. The house sank slow and sure. It came to rest on the flat grass right where Gemma stood, doors swinging open, tiled floor cool and wide inside. "It is yours now," Rosemary said. "You stood under it." Gemma walked in. The rooms were empty and bright. She could set seven workbenches here, and more. She unpinned the Mirrorstone and held it up to the first student. The face inside went steady and clear. Then a bird on the balcony lifted its head and screeched. Gemma stepped to the window. On the far road, a line of carts rolled toward the house. At the front sat a folding table, a thick ledger, and Edna Mull. She had come back, and this time she was not alone.

Edna's carts rolled right up to the floating house and stopped. She set her folding table across the open doorway. Her ledger lay flat on top. Behind her, carts packed with crates and chairs blocked every path to the balcony steps. Seven students stood on the grass with their tools, and not one could reach a workbench. Gemma stepped down from the doorway. The Mirrorstone warmed against her chest. She kept her breath slow. "You stand under a house you cannot pay for," Edna said. Her smile stayed flat. She tapped the ledger. "Your name is still here. Sign, or my carts stay until the debt eats this place too." Gemma looked at the wall of carts. She could not shove them. She could not outshout them. She thought of the stone on her chest, and what it did best. "My students came to learn," she said. "Let them. Watch what the stone teaches. Then decide if it is worth your ledger." A panda in a lab coat pushed through the students. Dr. May Goldstein had cleaned the poison off this very stone. Gold bangles clinked on her wrist. She carried a wax paper bundle and set it on Edna's table. A hot berry tart steamed inside, cranberries and blackberries glossy on top. "Eat," May said. "You argue better fed." She looked at Edna a beat longer. "Also, I know poison. I check what people sell." Edna's hand paused over the ledger. Gemma lifted the Mirrorstone free of her dress and held it toward Edna. The face inside the glass sharpened. It did not copy Edna's flat smile. It showed worry, and tired eyes, and something close to fear. Edna stared at her own hidden face. Her hand shook. A pink cart rolled up behind the convoy then, striped like a little train, hung with cotton candy and candy apples. The driver had seen the crowd and come for business. Children ran to it. A glowing moth drifted off the house's red tiles, wings gold and green, and circled Edna's table. The students laughed. The grass filled with noise and sweet smoke and light. The fear on the Mirrorstone's face did not match any of it. "You cannot summon ghosts here," Gemma said. "Too many happy hearts. The stone shows it. You have nothing left to frighten them with." Edna shut her ledger. She looked small behind her table. "Move the carts," she told her drivers. Wheels creaked. One by one the carts pulled back, and the path to the balcony cleared. But Edna tucked the ledger under her arm and did not cross out Gemma's name. "I will find what the stone is worth," she said, climbing onto the lead cart. "And I will come back with a buyer, not a threat." The convoy rolled off. Gemma's students climbed the steps at last and found their benches. The school was open. But Edna now meant to sell the Mirrorstone out from under her.

Three days after Edna's carts rolled off, a stranger came up the path. He drove a sleek black coach. Gemma stood on the balcony steps and watched him climb down. Edna sat beside him, ledger on her knee. She had found her buyer. The stranger wore a grey coat and counted coins as he walked, letting them clink one by one. "The mirror gem," he said. "I pay well for curious things." He fanned a thick stack of notes. Behind Gemma, her students went quiet at their benches. The Mirrorstone warmed against her chest. Gemma did not reach for it. She had learned what the stone did. It showed a person their true heart. A buyer who hid behind coins would not like what he saw. "Before you pay," she said, "look." She lifted the stone free and turned it toward him. The face in the glass sharpened. It did not match his smooth smile. It showed greed, and a hunger that never filled. The stranger stepped back. His coins slid from his hands and scattered on the grass. "That thing is cursed," he said. He climbed into his coach and did not look back. Edna stayed. She clutched her ledger. "You chase every buyer off," she said. "But the debt stays. I will find a buyer who does not care what he sees." Gemma came down the steps. She had planned for this. "Then let me pay the debt myself," she said. "Not with the stone. With work." She led Edna past the house to a small hut wrapped in willow strands. Green light fell through the leaves onto the door. "The healers here need cut gems for their charms. My students cut them. We trade the work for coin. I will pay your ledger in pieces, month by month." Edna's eyes narrowed. "You have no coin now." "I have students," Gemma said. "Watch." Inside the hut, a bright white bunny in a polka dot bowtie sat on a stool, foot tapping. He held a candied moonpear, its shell glossy as glass. A student had cut a facet into a plain stone, and the bunny pressed it into the pear's shimmering skin as a charm. The healers paid in coin for each one. Gemma set the first stack of coins on Edna's ledger. "The first payment," she said. "Cross nothing out. Just write it down." Edna looked at the coins a long moment. She lifted her pen. For the first time, she wrote a number beside Gemma's name that reduced the debt instead of growing it. "One payment," she said. "You miss one, and I come back selling." The coach was gone. The buyer was gone. The Mirrorstone stayed on Gemma's chest. But now a clock ticked. Every month she owed Edna coin, or lose the stone her whole school depended on.

The first payment bought Gemma a month. It did not buy her gems. She stood in the drifting house at dawn and looked at seven empty benches. Her students had tools. They had the Mirrorstone on her chest to guide them. But a jeweler needs rough stone to cut, and Gemma had used her last practice gems the day before. The lesson had stalled before the children finished it. No stones meant no cut gems. No cut gems meant no coin for Edna. The clock was already ticking against her. She went outside to think. A panda the size of a barn door stood at the edge of the clearing. Polka dots covered him. He held two ice cream cones that did not melt in the warm air. Patches Sweetberry traveled the realm handing out sweets, and Gemma had met him once at a crossroads. He did not smile now. He watched a hippo in a red ruffled dress sweep her arms through the air, over and over. "That is Carmen," Patches said. "She dances. She is looking for a stone too. So am I." He said nothing more. With Patches, the silence was the news. Carmen stopped mid-sweep. "Six years of this arm work," she said. "My teacher still looks away when he praises me." She studied the Mirrorstone on Gemma's chest. The glass sharpened. In it, Carmen saw her own face, steady and sure, not the doubting one she carried. She went very still. "That stone tells the truth," she said. "I would pay to feel like that face." Gemma's mind caught. People would pay to see themselves clearly. But she needed stones, not more buyers. She said so plainly. "I have a school and no gems. My students cannot practice. If they cannot practice, I lose everything by month's end." Patches set down one cone. "I know where rough gems lie," he said. "Three years I carried a preservation spell across the realm. I have seen the mountain crofts and the river beds. Stones sit in those places by the sackful. Nobody cuts them. They do not know how." He paused. "I will show you the places. I ask one thing. Teach the ones who have nothing. Children who cannot taste. People who look away from mirrors." Gemma understood the trade. Not a gift. A promise. "Agreed," she said. "Bring me the crofters and the river folk. I will teach any of them." They ate first. Carmen had brought a golden salmon casserole, its crust split and dripping. The students came out and shared it at the benches. Over the meal, Patches drew a map on a board. He marked three sites. Mountain crofters with buckets of raw stone. River families who sieved gems from gravel and threw them back. A valley where quartz broke loose after every rain. The plan was simple and it worked. Patches went ahead with his cones and his easy way. He told the crofters and the river folk about the silver fox lady who could turn their useless pebbles into charms the healers paid for. They came. They came with sacks. In exchange for lessons, they brought Gemma a steady haul of rough gems. One family would bring stones each week. Another the week after. The supply never ran dry again. Carmen stayed to learn. She set a dull stone on the bench and cut her first facet. She looked into the Mirrorstone and saw the steady face again. "My braceo is not finished," she said. "But this I can do." She did not look away. The first full lesson ran from dawn past dark. Seven students became twenty. Crofter children cut quartz. River folk shaped river stones into charms. The healers bought every piece. At month's end Gemma carried a heavy purse to the crossroads and set it on Edna's ledger. Edna wrote the number. The debt shrank. She wrote it again the next month, and the next. A year on, the drifting house still floated above Birchrot, but it held a true school now. Gemma walked the rows of benches in her gem-covered dress, the Mirrorstone cool against her chest. Children who once could not taste or could not hope bent over their stones and cut them clean. Patches handed out cones at the door. Carmen swept her arms through the braceo in the clearing, finished at last. The crofters and river folk kept the gems coming, week after week. Gemma had opened the finest jeweler's school Birchrot had ever seen, and the stones to feed it would never run out.