Four students get trapped at School No. 7 after hours and discover their physics teacher hiding a strange device in the lab, only for him to vanish before their eyes.
School No. 7 on Green Street changed after dark. The halls seemed longer, the shadows deeper, and every footstep Veronica, Michal, Igor, and Lena took came back to them a second later, hollow and wrong. They had stayed late for their physics project, arguing over formulas and sketches until they lost track of time. When they finally gathered their things, the main hall door refused to budge.
Veronica pulled the handle again, hard enough to rattle the frame. It was locked from the outside.
"That’s not funny," she said, though no one had suggested it was.
Michal pressed his face to the milky glass of the teachers’ office. The room was dark. Empty desks, empty chairs, no movement anywhere. Igor let out a nervous laugh that sounded too loud in the silence.
"We could always stay until morning," he said. "I’ve always wanted to know what school looks like when it’s haunting me back."
Lena shot him a look. "If you’re trying to be brave, it’s not working."
Before he could answer, something shifted somewhere down the corridor. Not a voice. Not a door. A rustle, quick and careful, like someone pushing aside papers or dragging a chair without wanting to be heard.
Veronica tightened her grip on her physics notebook. The pages felt damp in her hand.
"Did you hear that?" she whispered.
No one joked this time.
The sound came again, this time from the direction of the physics lab. The overhead light there was still on, casting a pale strip across the corridor floor. The door stood half-open, as if someone had stepped out in a hurry and forgotten to close it.
They moved closer, one reluctant step at a time.
Inside, Professor Białek was at the desk, bent over a strange metal device that looked nothing like any school equipment they had ever seen. He was shoving it into his backpack with the kind of urgency that made Veronica’s stomach tighten. Cables spilled over the edge of the bag. A small red light blinked once, then again.
"Professor?" Lena said, barely above a breath.
He froze.
Then Professor Białek turned.
His face went white when he saw them. For one suspended second, nobody moved. The air in the room seemed to crack, sharp with a faint metallic smell, and the light above the lab desk flickered so violently that the walls broke into pieces of shadow.
Professor Białek blurred at the edges, as if the room had lost focus around him.
Then he was gone.
Not leaving. Not running.
Gone.
The backpack dropped to the floor with a heavy thud, and something inside it gave off a thin, trembling pulse.