Sylwia and Adrian uncover a sealed door in an old tenement and step into a corridor of mirrors where reflections move on their own and something on the other side seems to be waiting.
The tenement on Złotnicza Street had a way of holding onto attention. Its windows glowed faintly after dark, as if someone inside had left a lamp burning for years, and the front door groaned whenever the wind pressed against it. Sylwia noticed all of it in the first weeks after moving in, but she had told herself it was only the usual strangeness of an old building.
That evening, climbing the stairs to her third-floor flat with a stack of books under one arm, she saw something that made her stop cold. At the end of the narrow corridor, behind the bend by the attic landing, the door that had always been chained shut stood half open.
Sylwia did not remember hearing anyone unlock it. The corridor was empty. The air felt different there, heavier, as if the building itself had drawn a breath and was holding it. She set the books down on the floor and stepped closer, one careful pace at a time, until the gap in the door was just wide enough to show a dim, silvered light beyond.
She pushed it open with two fingers.
On the other side was not another corridor, but a passage lined from floor to ceiling with mirrors. Light scattered in every direction, multiplying into a cold, restless shimmer that made it impossible to judge the distance ahead. Sylwia froze on the threshold, and then heard another pair of footsteps behind her.
Adrian stood in the doorway, his usual composure gone. He lived on the second floor and always looked as though nothing in the building could surprise him, which made the unease on his face more unsettling than fear would have been.
"You found it too," he said quietly.
Sylwia swallowed. "You know this place?"
He shook his head once. "No. That is the problem."
They moved in together, drawn forward by the strange sheen of the walls. The mirrors were flawless, seamless, stretching over the ceiling and down to the floor so completely that the passage seemed endless, folded into itself over and over. Sylwia lifted a hand and touched the nearest surface.
Her reflection smiled.
Not a polite imitation. Not a delayed movement. A slow, knowing curve of the mouth that Sylwia herself had not made.
She jerked her hand back. Adrian saw it too. His reflection had turned its head a beat before he did, as if it had been listening for something on the other side of the glass.
Then the mirrors began to hum.
It started low, almost like a vibration in the bones, and quickly rose into a thin, eerie chorus. Shadows moved across the reflective surface, too tall and too narrow to belong to either of them. One of the figures raised an arm from inside the glass, palm pressed flat as if testing the barrier between worlds.
The door behind them slammed shut.
Silence crashed over the corridor so completely that Sylwia could hear her own breathing turn shallow. In the nearest mirror, the smiling reflection slowly lifted a finger and pointed past them, deeper into the passage, where a dark shape was beginning to form at the far end.