The Girl in Apartment 3B

Chapter 1: The Knock

It started with a knock.

Three sharp taps on my apartment door at 12:03 AM.

By the time I opened it, the hallway was empty.

But an envelope lay on the floor — old, yellowed, unmarked.

Inside: a single Polaroid photo.

It showed a girl standing on my balcony, looking straight into the camera.

On the back, in shaky ink, it read:

“She’s not who you think she is.”

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Chapter 2: Ava

Her name was Ava. Apartment 3B.

She moved in three weeks ago.

We weren’t close, but I’d seen her almost daily.

Once, she borrowed salt and we talked for a bit.

She was strange, but warm. The kind of strange that makes you curious, not cautious.

She wore oversized sweaters, smelled like coffee and vanilla, and always seemed to be listening to music no one else could hear.

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Chapter 3: Gone

The next morning, 3B was empty.

I knocked, no answer.

I checked with the landlord — he frowned.

“There’s no Ava. That apartment’s been vacant for months.”

He wasn’t lying.

I saw it myself later.

3B was bare — no furniture, no toothbrush, no dust.

Like she’d never existed.

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Chapter 4: The Sketchbook

I broke into the unit that night.

Inside, it was cold and quiet.

The only item left was a sketchbook in the center of the living room.

Inside were rough pencil drawings — stairwells, windows, keyholes…

And then, a full-page portrait.

Of me.

Staring out my window.

The last page had a phrase scribbled dozens of times:

“I SEE YOU.”

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Chapter 5: The Tape

I work in tech. I pulled footage from the building’s hallway cameras.

From July 3rd to July 21st, Ava appeared daily — returning home, letting a cat inside, watering a plant.

Then she was gone.

But at 3:17 AM on July 22nd, she stood on my balcony.

Holding a Polaroid photo.

Looking directly into the hallway camera.

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Chapter 6: The Box

That night, I heard whispers through the walls:

“Don’t trust what you forget…”

I tore open the drywall behind my bookshelf.

Buried inside was a steel box labeled “3B,” sealed with a combination lock.

It stopped whispering the moment I touched it.

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Chapter 7: The Code

I remembered her sketchbook.

The “I SEE YOU” page had 27 repetitions.

Another page had faint numbers: 7 - 3 - 2

I tried the combination.

It clicked open.

Inside the box were:

A cassette tape labeled “Property of Project Mnemosyne”

A photo of Ava in front of a large underground door

A handwritten note:

“Memory isn’t truth. It’s the last thing they haven’t taken.”

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Chapter 8: The Basement Door

In the basement, I found a storage locker labeled 3B.

No padlock.

Just a thick wooden door, scratched to hell.

Inside:

A rusted bed frame, sink, a metal filing cabinet, and a huge door built into the back wall — like it grew from the stone itself.

No knob. No hinges.

It pulsed.

I found an old cassette player in the cabinet, pressed play.

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Chapter 9: Ava’s Voice

> “If you're hearing this, then you remembered. That’s dangerous.”

“They erase memories. Not people.

They feed on what you forget.”

“3B isn’t an apartment. It’s a leak — in your mind.”

“We volunteered. Project Mnemosyne.

To forget trauma. But the forgetting spread.”

“Don’t open the door. Please. Don’t let it out again.”

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Chapter 10: The Cabinet Files

I found my name in the filing cabinet:

3B: Ava Monroe – Corrupted

3D: Me – OBS-4. Status: Unstable. Subject remembers. Door activation inevitable.

There were others, too.

Neighbors I thought had moved out.

All listed as “Erased.”

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Chapter 11: The Call

My phone rang from a blocked number.

> “You opened the box… didn’t you?”

“Don’t say my name,” she whispered. “They listen when you say it.”

“You don’t know what I am. Or what 3B is.”

Then silence.

No record of the call.

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Chapter 12: The Final Polaroid

I found the original Polaroid.

The ink on the back had changed.

It now read:

“You have one memory left.”

I couldn’t remember my sister’s name.

Or what I did yesterday.

The Door was winning.

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Chapter 13: The Door Opens

I returned to the basement.

Ava stood in front of the Door — surrounded by glowing, flickering figures.

The forgotten.

> “You’re the last one who remembers,” she said.

“If you forget… we’re gone forever.”

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Chapter 14: The Other Side

I entered the Door.

It wasn’t a place.

It was everything lost — smells, faces, warmth, music.

I saw Ava’s childhood.

My first kiss.

My worst fear.

I grabbed them all.

Fought my way out.

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Chapter 15: Escape

I sealed the Door from the inside.

Everything screamed.

But it closed.

I woke up in my apartment.

Nose bleeding.

Ash on my clothes.

The box was gone.

Ava was gone.

But I remembered her.

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Chapter 16: The Ending

Now, I write everything down.

Names. Faces. Memories.

Because one thing still whispers to me every night:

“The door remembers who opens it.”

And one day, it might open again.

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💬 CTA (Call to Action):

Want to read the origin files of the scientists behind Project Mnemosyne or follow another forgotten subject’s journey?

Comment if you're ready for Part 4: The Mnemosyne Archives.

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Let me know if you'd like me to:

✅ Deliver this in .txt or .docx format

✅ Generate the cover image for the hallway and 3B

✅ Write your Facebook post caption to promote it

✅ Expand into a spin-off or alternate POV story from Ava's perspective

Shall we continue into Part 4 — or do you want this one uploaded first?