The Previous Tenant

Nadia Chen, twenty-six, has just moved into unit 4B of Harrow House — a weathered six-story brick building at the edge of the city, where the rent is a third of market rate and the landlord seemed relieved, almost grateful, to finally have a tenant again. The apartment is covered in sticky notes. Not reminders — rules. Yellowed, curling at the corners, written in different inks and increasingly unsteady handwriting: - "Don't look into the bathroom mirror for more than ten seconds." - "If you hear knocking at 3 a.m., count to seven before you open the door. Never sooner." - "The hallway light goes out on Thursdays. Don't be in the hallway on Thursdays." - "If a note falls off the wall, put it back. The order doesn't matter. That it's there does." - "It learns the rules faster than you do." Nadia assumes it's an elaborate prank left by the previous tenant — until she finds a loose floorboard under the bed, and beneath it a water-swollen diary. The first page reads: "If you're reading this, the notes weren't enough." The diary belonged to Sylvie Marsh, the tenant before her — recorded in the lease ledger as having "broken her lease early; no forwarding address." Its early entries are ordinary. Its later ones chart a slow unraveling: Sylvie documenting what the apartment responds to, which rules stopped working and when, the knocking that started answering back — and a final week she refused to write down at all. The building keeps its own schedule. The knocking comes at 3 a.m. to the second. The mirror holds a reflection a half-beat too long. Something moves inside the walls — the same wall cavity where Sylvie hid the diary, as if she had been feeding it paper to keep it occupied. Nadia must work out which rules still protect her, which have already quietly failed, and what Sylvie did during that unwritten final week — before whatever lives in unit 4B finishes learning her routines. Tone: slow-burn supernatural horror built on rules — the specific dread of instructions that used to work. Menace through pattern, routine, and the growing suspicion that the notes were never warnings. They were negotiations. No gore; the monster is rarely seen, only inferred from the shape of the rules it forces.