At Maria Skłodowska-Curie School, four students follow a forgotten room number into a part of the building that should not exist, and the quiet behind its locked door turns suddenly dangerous.
The Maria Skłodowska-Curie School looked ordinary from the outside and even more ordinary inside: grey carpet, warm lamps, corridors that smelled faintly of wet coats and floor polish. Rain tapped at the windows in a steady, tired rhythm, and the bell broke the morning into pieces as students spilled between classrooms.
Magda, Bartek, Ola, and Marek had claimed a narrow windowsill on the second floor as their refuge from the noise. They were in their third year, old enough to be bored by the school and young enough to still notice when something about it felt wrong.
Magda was the first to say it. "Have any of you ever actually looked at the floor plan?"
Marek glanced at the display case across the corridor and snorted. "If you're about to tell us we've spent three years missing a secret passage, I want credit for surviving this long."
Magda ignored him and pointed through the glass. "Room 214."
Bartek leaned in, already interested. "What about it?"
"We never have lessons there," she said. "I don't think anyone does. And yet it's on the plan."
Ola followed her gaze, her expression sharpening. "Maybe it's storage."
"Or locked for a reason," Bartek said, which only made him smile more.
That was enough. By the end of the maths lesson they had made their decision, and by the break they had slipped away from the flow of students and into the quieter corridors above the main floor. The further they went, the stranger the school became. The windows were clouded with old film. The light thinned. Every sound seemed to arrive a second too late.
At last they stood before a pair of wide doors with a faded metal plate between them: 214.
Marek tried the handle first. It didn't move.
"Locked," he murmured.
Bartek looked around the corridor, then down at the narrow gap beside an old cabinet pushed awkwardly against the wall. "There has to be some way in. Schools don't keep secrets behind furniture for nothing."
Ola crouched beside the cabinet and peered into the small ventilation opening. "I can get my hand through here. Maybe there's a latch on the inside."
A second later there was a soft click.
The door eased open just enough to let out a strip of strange greenish light. No desks. No posters. No whiteboards. Only shelves lining the walls, packed with dusty objects that seemed older than the building itself.
Magda took one careful step forward and stopped. "Do you feel that?"
The others did.
The air inside the room was colder, denser, as if the silence had weight.
Then the door slammed shut behind them with a crack that made all four of them jump. Bartek swore under his breath. For a heartbeat nobody moved. Marek reached for the blackboard at the far end of the room, more to steady himself than anything else, and the moment his fingers touched the surface, one of the shelves shifted with a low grinding sound and began to slide aside, revealing...