Kuba, Ola, and Tymon follow a rumour under the bookshop and find a hidden tunnel no one was meant to open.
Kuba had a habit of noticing the things everyone else walked past: the cracked stone at the edge of the square, the boarded-up doorway behind the bakery, the way the old town looked harmless until dusk made it feel like it was holding its breath.
So when he met Ola and Tymon by the fountain on Friday evening, he already knew they were in the mood for trouble.
"I heard something today," Ola said, leaning on the fountain rim. Streetlight caught in her eyes and made them look sharper than usual. "In the cellar under the bookshop. The workers uncovered a blocked passage."
Tymon snorted. "A passage to where? More mould? More dead rats?"
"Maybe," Ola said. "Or maybe something nobody's been down in years."
Kuba said nothing at first. He stared across the square at the bookshop, its upper windows glowing softly above the dark street. Old buildings always had stories. This town had so many locked doors and sealed rooms that it sometimes felt less like a place and more like a puzzle someone had abandoned half-finished.
"You want to look," he said.
Ola grinned. "I knew you'd say that."
An hour later they were standing in the alley behind the bookshop, each of them holding a torch. Ola had brought a ring of keys she claimed she had only "borrowed" from her grandmother, who owned the shop and loved telling stories about smugglers, merchants, and tunnels that ran under the market square long before any of them were born.
The cellar door gave a long, reluctant squeal when Ola pushed it open. Cold air rolled out, carrying dust, damp stone, and the faint smell of old paper. Their torch beams jittered over shelves of forgotten boxes, broken frames, and stacks of books tied with fraying string.
At the back of the cellar, behind a heap of rotten cardboard, Kuba spotted the wall.
It didn't look right. The bricks were older than the rest, and several had already been pried loose. Someone had been here before them.
"Look at this," Ola whispered.
Half-hidden in the mortar was a carved mark: three interlinked rings.
Tymon crouched beside it. "I've never seen that symbol anywhere in town."
"Neither have I," Kuba said.
He and Tymon worked at the loose bricks while Ola held the light steady. A few came away with a gritty scrape. Then the wall shuddered, and a section gave way with a hollow thud, revealing a narrow opening that exhaled a blast of icy air from the dark beyond.
The tunnel was too low to stand straight in, too narrow to turn around comfortably. Water dripped somewhere ahead, slow and measured, like a clock counting down. Ola went first, sliding through the gap with her torch raised. Kuba followed, then Tymon, the stone pressing close on both sides as they moved deeper underground.
The passage twisted beneath the square, the walls slick with age. Faded paint clung to parts of the stone in strange, half-erased shapes that might once have been signs or symbols or warnings. Above them, the city was only a distant vibration: a muffled footstep, the faint hiss of tyres on wet road, a burst of laughter that seemed far away enough to belong to another world.
Then Ola stopped so abruptly that Kuba almost bumped into her.
Her light had landed on a steel door set into the tunnel wall.
It had a combination lock.
Across the metal, someone had carved words deep enough to catch the torchlight: To the brave the world belongs.
"Who puts a door like that underground?" Kuba murmured, brushing his fingers over the cold surface.
"Someone who really didn't want it opened," Ola said.
Tymon knelt by the lock, squinting. "Wait. Look at the panel. The three rings are here too. I think that's not a warning. I think it's a key."
Kuba was about to answer when a sound came from behind the door.
Not a bang. Not a crash.
Just a faint movement, soft as a step in the dark.
They froze.
For one impossible second, nobody spoke, nobody breathed, and Kuba could hear only the water dripping somewhere deeper in the tunnel.
Then something shifted again on the other side of the steel, as if someone had just turned toward them.