Lena, Kuba and Tom follow Simon’s last message to a metro station that should not exist, and discover a hidden underground world where every answer seems to open another door.
At night, when the lanterns in the Old Town threw long, wavering light across the cobbles, Lena, Kuba, and Tom stood before a metro entrance that did not appear on any public map. The staircase sank into the earth like a wound in the street. Above it hung a rusted sign: Station Zero.
Lena kept her hands in the pockets of her coat so the others would not see them shaking. Her younger brother Simon had vanished a week earlier, leaving no trail except one message sent at 2:13 a.m.: Find Station Zero. The key lies underground.
She had read those words so many times they no longer felt like text. They felt like a warning.
The stairs groaned under their weight as they descended. The noise of the city vanished behind them, replaced by a cold hush and the wet echo of their footsteps. The air smelled of iron, dust, and something older. Somewhere deeper below, water dripped with the patience of a clock.
The platform was empty. No trains. No announcements. Only a row of dead lamps and a single door set into the far wall, its paint blistered away by time. On the metal panel, barely visible beneath the grime, an owl had been stamped into the surface.
Tom stopped so abruptly that Kuba nearly bumped into him.
"Tell me you see that," he muttered.
Lena did not answer. She was already moving toward the door, because the feeling had started again, the one that had followed her since Simon disappeared: the sense that she was arriving somewhere he had already been, and that someone was still waiting for her to catch up.
The door was unlocked.
Behind it stretched a narrow footbridge over a vast black drop. Beyond the bridge, a cavern opened like a second city buried under the first, lit by a dim green glow that made every wall look diseased and every shadow deliberate. Below, rows of masked figures moved between towering maps pinned to the stone. Some of the maps showed streets Lena recognized. Others led into places she had never imagined could exist.
At the centre of the chamber stood a huge clock. Beside it, on a pedestal of dark metal, rested something small and bright enough to hurt the eyes.
A key.
Lena took one step forward, and the whole room seemed to inhale.
Then the clock struck midnight.
The bridge shuddered beneath them. The floor shifted with a deep, grinding motion, as if the underground city had just awakened and decided they were no longer guests.
A voice brushed the air beside Lena’s ear, quiet as breath:
"If you want what was lost, keep going. But understand this first: not everything below is what it seems."
She turned sharply, but there was no one there.
Only the key, gleaming in the dark, and the masked figures lifting their heads at once.