Three students sneak into a half-renovated wing of their school and uncover a sealed white door marked with a strange Latin name. Behind it waits a challenge they were never meant to find.
The final bell had barely faded when Veronika, Michal, and Lena slipped away from the crowd instead of heading for the exit. The new wing of the school still felt half-finished, half-forbidden, all sharp edges and rumours. Builders had left behind tarps, dust sheets, and a smell of paint that never seemed to leave the air.
Michal slowed near the corridor bend. Yesterday, when he had come here to deliver chalk for the teacher, he had heard something below the floorboards. Not a pipe knocking. Not the wind. Something deliberate, like a door being tested from the other side.
Now the three of them stood in the pale light leaking through dirty windows, listening to the building settle around them. The silence pressed close. Lena noticed a tile set slightly crooked in the wall. She touched it once, then looked back at the others.
"There," she whispered.
Veronika wedged her fingers into the gap and pulled. Dust rained down. Behind the tile sat a small, rusted key, cold enough to sting. Michal turned it over in his palm, trying to place where it might belong, but nothing in the renovation plans had mentioned a hidden room, let alone a key.
They followed the corridor past stacked bags of cement and a ladder draped in plastic sheeting until Lena stopped so abruptly that Veronika almost walked into her.
A white door stood in the wall, narrow and clean against the unfinished corridor, as if it had been installed from another building altogether. A tarnished plaque hung beside it. The letters were half worn away, but the words were still readable: Sanctum Dentis.
"Latin," Lena said under her breath. "Something to do with teeth."
Michal looked at the key again. His hand had gone damp around the metal.
It fit.
The lock turned with a dry, reluctant click, and the door opened inward on a breath of stale air. Darkness waited inside, broken only by a thin blade of light from somewhere high above. In that dimness, shapes began to sharpen: old barber chairs lined in a row, a large wall clock with a cracked face, and a glass urn packed with toothbrushes so many they looked like bones.
Portraits hung along the walls, their eyes lost in shadow. In the centre of the room stood a box wrapped in white paper and sealed with a red cord.
Then a sign flickered to life on the inside of the door.
Without answering the Hygienist's question, you will go no further.
A rustle came from behind the chairs. Something shifted where the light could not reach. Then a voice, low and rough with disuse, spoke from the dark.
"Who dares disturb the rest of the Guardian of the Smile?"
The three of them froze. From the shadows, something began to rise.