The Unnumbered Corridor, Part 2: The Warm Key

The Unnumbered Corridor, Part 2: The Warm Key

The Story Begins

When the unnumbered corridor disappeared, only an ordinary patch of wall with peeling green paint remained. Nora stared at it a moment longer. Just minutes ago, there had been doors, a dark carpet, and a narrow space that did not exist on the building plans.

“So we agree,” Filip said, trying to keep his voice calm. “We did not see it only because we were tired.”

Ben tightened the strap of his dark backpack. “I’m tired now. And I still see it when I close my eyes.”

The lift beside them gave a quiet groan. It was not the sound of a modern lift. It sounded more like an old fridge that had decided to whisper through a wall.

“Let’s go downstairs,” Ben suggested. “At least while the lights are still on.”

Nora nodded, though she did not want to leave. In her small paper notebook, she had already written three things: the lights went out, the corridor appeared, there were no numbers on the doors. She had left the fourth bullet point blank. She did not yet know what to add.

When she turned towards the lift, something flashed on the tiled floor.

It lay right by the threshold, where the lift doors closed into two metal panels. A small old key. Brass, darkened with age, with a round bow and two tiny teeth at the end.

“That wasn’t there before,” Nora said.

Filip bent down, but did not touch it. “Maybe it fell out of someone’s pocket. Mrs Richterová has a huge bunch of keys.”

“But she wasn’t here,” Ben reminded him.

“That does not mean she could not have passed by yesterday. Or last week.”

Nora pushed up the sleeve of her grey hoodie beneath her rust-red jacket. Then she carefully picked up the key with two fingers.

She froze at once.

“It’s warm.”

“Warm like what?” Ben asked.

Nora shifted it into her palm. The brass was not simply less cold than the floor. It felt pleasantly warm, almost like a mug of tea someone had held a moment ago.

Filip raised his eyebrows. “Maybe it was near the lift motor.”

“The motor isn’t by the threshold,” Nora said.

“Fine. Then it could have been in an adult’s pocket.”

Ben looked towards the empty staircase. A yellowish bulb shone at the end of the corridor, and a thin cobweb trembled beneath it. There was nobody there.

“If an adult had been here,” he whispered, “we would probably have heard a door. Or footsteps.”

“Maybe they left in the lift,” Filip said, though he glanced at the unmoving lift doors.

Nora took out her notebook and set it on the windowsill. With her pencil, she sketched the key’s shape, the number of teeth, and the small letter on its bow. It looked like a K, except that its lower stroke curved oddly.

“I’ve seen this before,” she murmured.

“On the key?” Filip asked.

“No. In the building. Maybe on the old mailbox in the basement. Or on the noticeboard by the boiler room.”

The boy leaned closer. The torch clipped to his belt bumped against his hoodie. “It could be a maker’s mark. Old locks had their own marks.”

“Or the mark of a wing,” Ben said quietly.

Both of them looked at him.

“Mrs Richterová once said the building had looked different long ago,” he went on. “She mentioned a back section that was demolished during the renovation. I thought she meant some shed. But then she said, ‘Some doors remained, even though there was nothing behind them any more.’”

When Things Start to Change

Nora wrote the sentence down exactly, including the comma before even though. Their teacher always said exact notes were like good clues: they should not be smudged.

Filip scratched his head. “That still does not mean there’s a secret wing behind this wall. Buildings have service shafts, old ventilation spaces, and unused storerooms.”

“And which of those appears only after the lights go out?” Nora asked.

He had no answer ready.

The lift groaned again, this time for longer. The metal doors did not move, but the sound travelled through the wall and into the tiles beneath their shoes.

Ben fell silent. “Do you hear that?”

“Lift cables,” Filip said automatically.

“No. Behind that.”

All three held their breath.

At first, they could hear only the soft hum of the old lift. Then something else joined it: a short, quiet click, as if someone on the other side of the wall had unlocked a door.

Nora’s stomach tightened. The key in her palm was still warm.

“We don’t have to go in,” Ben said quickly. “If it appears again, we can just look. From a safe distance.”

“That’s a good plan,” Nora agreed. “First we observe. Then we decide.”

Filip nodded. “And if we go closer, we stay together. No heroic splitting up in a dark corridor. That only works in films, where people are clearly desperate for trouble.”

Despite everything, Ben gave a brief smile.

Just then, the light above them flickered twice.

The first flicker was quick. The second lasted longer.

Then everything went dark.

The darkness in the old corridor was not complete, because dull streetlight filtered through the dirty window. Even so, Nora could not see Filip’s face. She heard only Ben’s quick breath and the scrape of a zip on his jacket.

Somewhere above them, the lift cables moved. A long metallic rumble sounded.

“I’m here,” Nora said.

“Me too,” Filip replied.

Ben’s “yes” was quieter, but it came immediately after.

The light returned for only a fraction of a second.

The wall opposite the lift had vanished.

In its place opened a narrow corridor with a low ceiling. The wallpaper had faded to the colour of old paper, and the carpet was dark, almost blue. The first door stood on the left. Its brass handle was coated in dust.

Then the bulb went out again, but the corridor did not disappear.

A faint grey light came from inside it. Not electric light, but the kind that comes before rain.

“This time it stayed,” Filip whispered.

Nora raised her hand. The key in her palm grew warmer still.

“Maybe it didn’t stay,” Ben said. “Maybe it’s waiting.”

Nobody laughed.

Nora took a step forwards, then stopped at the threshold. Behind her were the lift, the staircase, and the ordinary building. Before her was a space that should not have existed. She knew fear was not an order to run away. Sometimes it was only a warning to look more closely.

“Filip, you’ll light the way. Ben, watch whether anything changes behind us,” she said. “I’ll try the door. If the corridor starts disappearing, we come back at once.”

“That sounds quite sensible,” Filip admitted, taking out his torch.

“And quite scary,” Ben added.

They went in together.

The carpet swallowed the sound of their footsteps. The corridor was shorter than it had seemed from the threshold, but Nora still felt as though they had walked farther than a few metres. The air smelled of dust, cold metal pipes, and something dry—perhaps old books.

An Important Moment

She stopped at the first door.

A metal plate was fixed to the frame, just beneath the peeling paint. Filip shone his torch on it.

The letters were small and partly rusted. Nora read them aloud.

“Wing K. Service Access. 3A.”

“Wing K,” Ben repeated. “Like on the key.”

Filip knelt to inspect the plate. “Three A could be a room number. Old plans used numbers and letters. That’s normal.”

“And a corridor that appears when the lights go out is normal too?”

“I said the plate was normal,” he replied. “Don’t take everything away from me at once.”

Nora slid the key into the lock.

It fitted perfectly.

For a moment, nothing happened. Then came a firm click, quiet and clear. The handle moved beneath her fingers.

Ben took half a step back. “If there’s something in there that moves by itself…”

“Then we come back,” Nora said.

She opened the door only a little.

No monster waited behind it, and no long staircase led into darkness. There was only a small service room, barely large enough for three people. Old grey-painted pipes ran along one wall. On a shelf lay coiled cables, two empty glass bottles, and a tin box with a rusty lid.

On the opposite side stood a narrow metal cabinet.

“See?” Filip breathed out. “A utility room. Exactly what I said.”

“Not exactly,” Nora reminded him. “You said a shaft.”

“A room, a shaft… technical things come in many shapes.”

But Ben was not looking at the pipes. He was staring at the cabinet. “It’s locked.”

A small brass padlock hung from its doors. It was the same metal as the key in Nora’s hand. She looked at her friends.

“Shall we try it?”

Filip bit his lip. “If the key opened the door, maybe it belongs to the whole old system. Just don’t pull anything hard.”

Ben was silent for a moment. Then he nodded. “Let’s open it. But if we find only old heating bills, I’ll be disappointed.”

The key slid into the cabinet lock as easily as before. When Nora turned her wrist, the lock clicked open.

There were no bills inside. Instead, there were thin files, an envelope tied with a faded blue ribbon, and a folded plan of the building. The paper had yellowed, but its lines were still clear.

Filip carefully unfolded it on the shelf. He shone his torch on the floor plan.

“Look,” he said.

The present building was drawn in dark lines. Behind it stretched another section, marked in paler ink. It had an internal staircase, a long corridor, and several small rooms.

Above it were the words: WING K — REMOVED DURING THE 1987 RENOVATION.

Goosebumps ran down Nora’s back. She quickly copied the words into her notebook.

“So it really existed,” Ben said. “It wasn’t a shed.”

“And this room was part of it,” Filip added. He traced a dotted route on the plan with his finger. “But according to this, it should now be beneath part of our staircase. That makes no sense.”

“A lot of things don’t make sense today,” Nora said.

Beneath the plan lay a small cardboard name tag. It was as thin as a library slip and bore a blue ink mark in one corner. Nora picked it up.

On the front, neat childlike handwriting read: KLÁRA V., FIFTH FLOOR.

On the back were four short lines.

If they change the building, memories do not have to disappear.

I put them where someone who notices will find them.

What Comes Next

Below the words was a drawn symbol: a curved K, just like the one on the brass key.

The room suddenly became very quiet.

“Klára,” Ben whispered. “It’s her.”

Nora looked at him. “Do you know who she is?”

“Not really. But Mrs Richterová said her name once, when she thought no one could hear. She was looking for something in a cabinet and said, ‘Klára would know where she put it.’”

Filip studied the name tag without joking. “This is a real clue. Paper, ink, a plan, a renovation year. We can check it.”

“And a message,” Nora added.

“A message is harder to check,” he admitted. Then he pointed to the K symbol. “But not this. The mark is on the key, the door, and the tag. That is no longer a coincidence.”

A muffled sound came from the corridor, as if a door had closed somewhere very far away.

Ben tensed his shoulders, but this time he did not glance towards the exit. He only listened.

“It feels different,” he said. “Before, I felt as if someone were watching us. Now… I don’t know. It’s as if we should leave, but not because something is chasing us.”

The grey light by the door faded.

Nora put the name tag back on the shelf, then hesitated. She was not sure they should take an original clue without permission. She could not photograph it either; phones often did not work in the corridor, and hers remained in her jacket like a useless piece of glass.

Instead, she opened her notebook and copied every word. She drew the name tag, the symbol, the number 3A, and the part of the plan marked Wing K. Filip dictated exactly where the room was. Meanwhile, Ben stood at the open door and guarded their way back.

“The light is fading,” he said after a while.

Nora snapped shut her notebook. “Done.”

She took the key from the cabinet. It was still warm.

When they stepped into the corridor, the carpet no longer looked as dark as before. The walls began dissolving into soft grey dimness. It was neither sudden nor threatening. It was more like steam slowly disappearing above a hot cup of tea.

“Back together,” Filip reminded them.

They walked to where the lift should have been. Behind them, the first door quietly closed by itself, without a bang. Nora did not turn around. She held her notebook against her chest and watched only the pale rectangle at the end of the corridor.

A moment later, they were standing by the lift again.

The bulb above them shone brightly. The wall opposite was ordinary, green, and cracked. The unnumbered corridor had disappeared.

Ben breathed out so loudly that Filip smiled. “I think your caution saved my plan to pretend I wasn’t scared.”

“Your plan didn’t work,” Ben said.

“That’s a technical observation, not a personal attack.”

Nora looked at the key. Its brass gleamed softly in the light, but when she pressed it into her palm, she could still feel its warmth.

She added the final bullet point to her notebook: Key by the lift. Warm. K symbol. Opened door 3A and cabinet.

Below it, she added two questions.

What does Wing K mean today, when it was removed long ago?

And who left the key exactly where they were meant to find it?

At last, the lift chimed and its doors opened. The cabin was empty. The children stepped inside together.

Just before the metal doors closed, Nora looked once more at the wall opposite. There was nothing unusual in the dull green paint.

The End of the Story

Only near the floor, for a moment, a tiny brass reflection flashed, as if someone had just set down another key.