When Lena is handed a silver key by a stranger, it leads her to a hidden school inside an old mirror, where the corridors shift and something is clearly waiting for her.
Lena dragged her feet all the way home, letting the rain soak the hem of her coat before she remembered to pull her scarf tighter. The afternoon had gone grey and restless, the kind of weather that made the streetlamps glow too early. She was almost past the antique shop on the corner when she stopped.
A man in a long coat stood behind the fogged glass, watching her. In his gloved hand, he held a small silver key. He gave her a slow, deliberate smile, as if he had been expecting her for hours.
Before Lena could decide whether to run or step closer, the shop door opened with a brittle jingle. Inside, the air smelled of dust, old wood, and something sharper, like struck metal. Shelves crowded the walls, stacked with cracked clocks, tarnished frames, and books with faded spines. The man came toward her without hurry.
"This key is for you, Lena," he said. "It will open only one door. You already have it in your house, but you have to look properly."
He pressed the key into her palm. It was colder than the rain. He did not explain anything else, and somehow that made the whole thing worse.
By the time Lena reached her flat, her fingers were trembling. She shut the door behind her, leaned against it for a moment, and pulled out the key again. Silver patterns curled across it like a web caught in moonlight. She searched the hallway, the living room, even the kitchen, until her eyes landed on the old mirror by the front door. Its frame was dark with age, and the glass had always made her reflection look slightly too still.
The moment she held the key near it, the metal gave a faint shiver.
Lena froze. The mirror’s surface quivered, then rippled outward as if someone had dropped a stone into water. A thread of light flashed across the glass.
She reached out.
The mirror opened around her hand.
One breath later, Lena was standing somewhere else.
The hallway on the other side stretched long and bright, lined with doors of every shape and size. The air glittered with dust that looked almost like stars. Voices drifted through the corridors, low and secretive, and every surface seemed touched by colour, as if the whole place had been painted by someone who had never seen the world before and had still managed to make it more beautiful.
Above the nearest archway hung a wooden sign:
School on the Other Side of the Mirror.
Lena stared at it, barely daring to breathe. Then a voice rang out behind her, bright and annoyed.
"You’re late for magic lesson, Lena!"
She turned.
At the far end of the corridor, a girl with green hair was waving both arms at her. Before Lena could answer, the doors around her began to swing open all at once. Mist spilled from one. From another came a flock of glowing butterflies. From the last stepped a tall figure in a cloak stitched with silver runes, and every whisper in the corridor fell silent.
The silver key in Lena’s hand turned once, as if something had just unlocked.