Eve and her friends stay late at school to finish a presentation, but a hidden hatch behind a wardrobe leads them into a corridor no one is supposed to know about.
Eve snapped her chemistry notebook shut and glanced at the classroom clock. Outside, the last light of day was bleeding out behind the sports hall, turning the dirty windows silver and grey. In less than an hour, the caretaker would start locking the building, and the school would go quiet.
Mrs Karpowicz had let them stay after lessons to finish their competition presentation, which meant Eve, Kuba, Agata, and Filip had claimed the back table and spread a laptop, printouts, and half-empty bottles of water across it like they were setting up a tiny command centre.
"Does anyone know where the socket is?" Agata asked, turning a power bank over in her hands.
Filip didn’t look up from the screen. "Behind the wardrobe, I think. Or where the school hides all useful things."
Kuba gave a short laugh, then stopped. He had gone still, staring past the whiteboard as if he’d heard something he couldn’t quite place. The corridor outside was empty, but the silence had sharpened into something restless, almost watchful.
Eve stood up and dragged the wardrobe a few centimetres to the side. Something scraped under the legs. She crouched, brushed away a layer of dust, and froze.
A small wooden hatch was set into the floorboards.
"Guys," she said, keeping her voice low, "you need to see this."
They crowded around her. Filip knelt first, then Kuba. Agata peered over their shoulders, frowning. The hatch had no handle, only a rusted metal ring sunk into the wood.
"That wasn't on any floor plan," Kuba murmured.
"Maybe it's storage," Agata said, though she sounded unconvinced.
They wedged a ruler under the edge, then Eve’s penknife. The wood gave way with a dry crack, and the hatch swung open on stiff hinges.
Cold air rose from below.
A narrow staircase disappeared into darkness, the steps old and uneven, the walls around it made of bare brick that none of them had ever seen before.
For a second nobody moved.
Then Filip swallowed. "Tell me that doesn't look like part of the school."
Eve was already leaning forward, shining her phone light down the steps. The beam caught a narrow corridor below, brick walls slick with age, and something else too: a soft movement at the far end, just out of reach.
Then a sound came from underneath them, slow and dragging, like something had just turned the corner and was coming their way.