The first time Lucas saw the note, he thought it was a mistake.
He had just moved into apartment 4B on a Tuesday evening, dragging two suitcases and a box of kitchenware up three flights of stairs because the elevator had been out of order since morning. The door was scratched near the handle, the paint peeling in thin curls like old wallpaper. When he unlocked it and stepped inside, the air smelled faintly of dust and someone else’s laundry detergent.
He dropped his keys on the counter and turned back to close the door.
That was when he noticed it.
A small white piece of paper, no bigger than a sticky note, taped to the inside of the door at eye level. The handwriting was neat, almost careful:
Please do not forget to lock the door at night.
Lucas frowned. He hadn’t put it there.
He peeled it off and threw it into the trash bin by the kitchen sink. It felt like something the previous tenant had left behind, an ordinary reminder that had lost its meaning.
That night, he locked the door, took a shower, and fell asleep on the bare mattress.
The next morning, the note was back.
It was on the inside of the door again, in the same spot, taped at the same slight angle. Same paper. Same handwriting.
Please do not forget to lock the door at night.
Lucas stared at it for a long time. He checked the windows. They were closed. The front door had been locked from the inside. He even checked the trash bin. The note he had thrown away was gone.
He told himself it was nothing. Maybe the landlord had slipped in while he was asleep. Maybe he had forgotten he put it there himself. Moving made people strange.
He tore it up and flushed it down the toilet.
On the third night, he came home late from work. The hallway light flickered above his door. His key felt heavier than usual in his hand. When he opened the door, the note was waiting.
Please do not forget to lock the door at night.
This time, the paper was not taped neatly. It was pressed flat against the wood, as if someone had smoothed it down with their palm.
Lucas stepped back into the hallway. His neighbor across the hall, an older woman with gray hair and a blue robe, was watching him from behind her chain lock.
“Excuse me,” he said. “Did you see anyone come into my apartment today?”
She shook her head slowly. “No one came in.”
“Did anyone leave?”
Her eyes moved to the note on his door. She did not answer right away.
“That note has been there for years,” she said.
Lucas felt a cold line run down his back. “Years?”
“Before you. Before the man before you. I don’t know who writes it. But it always comes back.”
She closed her door softly.
Lucas went inside and locked the door. He sat on the floor with his back against it and listened to the apartment. The refrigerator hummed. A pipe knocked somewhere in the wall. Outside, a car passed slowly, its headlights sweeping across the ceiling like a searchlight.
He did not sleep well.
In the morning, the note was still there.
He stopped trying to remove it.
Days passed. He began to notice other small things. The bathroom mirror was always slightly fogged when he came home, even though he had not taken a shower. The chair at the dining table was sometimes pulled out a few inches, as if someone had just stood up. Once, he found a single wet footprint near the sink, though the floor had been dry when he left.
He started locking the door every night without being reminded.
He told himself it was practical. He lived alone now. The building was old. The neighborhood was quiet, but quiet did not always mean safe.
Still, the note remained.
One evening, after a long day at work, Lucas came home exhausted. He opened the door, dropped his bag, and saw the message again.
Please do not forget to lock the door at night.
Something about it made him angry. Not because it was strange, but because it felt personal. It felt like someone was watching him, judging him, waiting for him to make a mistake.
He grabbed the note and ripped it into pieces. He opened the window and threw the fragments into the night.
“I don’t need this,” he said aloud.
The apartment answered with silence.
That night, he left the door unlocked.
He did not mean to. He was tired, distracted, half-asleep. He lay in bed staring at the ceiling and told himself it did not matter. Nothing would happen. The building was safe. The neighbors were quiet. The note was only paper.
Sometime after midnight, he woke up.
The bedroom door was open.
He always closed it before sleeping.
Lucas sat up slowly. The apartment was dark, but not completely silent. There was a soft sound coming from the front door, like paper sliding against wood.
He did not move.
He listened.
The sound stopped.
Then, from the hallway, he heard something gentle and precise, the way someone might tape a note onto a door.
In the morning, the note was back.
Please do not forget to lock the door at night.
Lucas stood in front of it for a long time. He wanted to rip it down again. He wanted to call the landlord, change the locks, move out. But something kept him still.
The handwriting looked different.
Not much. Just enough.
The letters were slightly less neat, as if the writer had been in a hurry. Or as if the writer had been learning.
He reached out and touched the edge of the paper. It was warm.
That night, Lucas locked the door before he even took off his shoes. He checked the windows. He checked the bathroom. He checked the closet. Then he stood in front of the door and looked at the note.
He did not remove it.
Days turned into weeks. The note stayed. The apartment stayed quiet. The strange little signs—the fogged mirror, the moved chair, the wet footprint—stopped appearing. Or maybe Lucas simply stopped noticing them.
He began to feel safe again.
One Saturday morning, he woke up early and made coffee. The sunlight came through the kitchen window in thin yellow lines. The building was quiet. For the first time since moving in, he felt like the apartment belonged to him.
He walked to the front door to check the lock, more from habit than fear.
The note was still there.
But the message had changed.
Thank you for remembering.
Lucas read it once. Then again.
He waited for fear to rise in his chest, but it did not come. Instead, he felt something quieter, something he could not name. It was not relief. It was not comfort. It was closer to the feeling of realizing you are not as alone as you thought.
He left the note on the door.
That night, before going to bed, he locked the door and paused with his hand on the handle. The apartment behind him was dark and still. Somewhere in the walls, a pipe knocked once and fell silent.
Lucas looked at the note one last time.
Then he turned off the light and went to sleep.
And for the first time, the apartment slept with him.
