On a summer night in Krakow, three friends follow an old family map into the tunnels under the market square and find a fresh symbol in the dark. Something is waiting below.
The air in the Old Town had gone heavy after the rain, as if the stones themselves were holding their breath. Anna, Kuba and Marta moved between the dark shopfronts and the shining puddles, their footsteps soft on the cobbles. It was nearly midnight. Most people had already gone home, but Anna kept checking the folded paper in her hand, as though it might change if she looked at it long enough.
The map had been buried for years among her grandmother's things, hidden inside a book with a cracked spine. The paper was thin and yellowed, the ink faded to a brownish blur, except for one line that had been drawn with unsettling certainty. It led beneath the market square and stopped behind the fountain. There, in a cramped hand, were the words: Entrance only on solstice night.
Kuba had laughed when he first heard it. Marta had called it a joke. Yet here they were, drawn onward by curiosity and the strange, stubborn feeling that someone had meant for the map to be found.
Behind the fountain, the square was almost empty. The pigeons were gone, the benches slick with rain, the bronze figures around the basin dark with water. Marta crouched first, brushing away a patch of wet leaves. Her fingers stopped on cold metal.
"There," she whispered.
Under the rusted grate was a square trapdoor, its edges swallowed by moss and shadow. Kuba knelt beside it at once, slid a penknife into the seam, and gave a sharp twist. The metal shifted with a groan that seemed far too loud in the silent square.
Cold air rose from below, carrying the smell of wet stone and something older. Anna felt her throat tighten as they descended one by one into the dark, their phone lights trembling over rough walls and low arches. The passage narrowed quickly, turning the city above them into a distant memory.
The tunnels were nothing like the museum galleries tourists saw. These were raw, cramped corridors, blocked in places by old brickwork and streaked with damp. Their footsteps came back to them from different directions, so that it was hard to tell how many sounds they were making. Marta kept close to Anna's shoulder. Kuba moved ahead, one hand on the wall, trying to look braver than he felt.
Then Anna stopped.
On the tunnel wall, just ahead, someone had painted three intertwined spirals in fresh red paint. It was too bright, too new, too deliberate to belong here. The colour still gleamed wetly in the beam of her phone.
"What is that?" Marta breathed.
No one answered. From deeper in the passage came a faint sound, almost a whisper, too soft to be a voice and too steady to be the wind. Kuba lifted his light, scanning the blackness ahead.
Anna took one step back.
Behind them, metal slammed shut with a violent clang, and the way out vanished in the dark. Then, around the bend in the tunnel, a pale light flared once, brief as a blink, as if someone had just turned to look straight at them.