The Custodian’s Math

At twenty-nine, I traded my hammer for a janitor’s keyring, hoping to pay for night classes at the community college. The job was simple: clean the Old Annex, a two-story brick building from 1924 that the congregation had abandoned for a newer worship hall. My wife, Clara, thought it was perfect—flexible hours, close to campus, and the peace and quiet I needed for studying. Our daughters, Emma and Lily, loved the idea of me working in a ‘haunted house,’ but I laughed it off. I didn’t believe in ghosts. I believed in dust, grime, and the satisfying squeak of a clean floor.

The building had a peculiar layout. The main floor held a fellowship hall and a small kitchen. Below, a basement with a furnace and storage rooms. Above, a long hallway lined with Sunday school classrooms. My rounds began with the basement, then the main floor, and finally the upper hallway. It was monotonous until I discovered the ‘Old Ledger’ in a forgotten classroom closet. It was a logbook from the 1940s, kept by a previous custodian named Henry. Each entry was dry—’Boiler inspected, pressure normal. Classroom 3 swept. Windows latched.’ But near the end, his notes grew erratic: ‘Scratching in the walls again. Checked the boiler room, nothing. Must be mice. But the pattern… it’s too regular.’

I found the pattern myself on a Tuesday night. I was mopping the upper hall when I heard it—a faint thump, followed by two quick taps, then silence. I wrote it off as the building settling. But the next night, it returned: thump, tap-tap, pause, then thump, tap-tap, tap. It was methodical, almost like a code. I searched the rooms, the closets, even the attic hatch, but found nothing. The sounds stopped when I stopped moving. I started to feel like the building was playing a game with me.

It wasn’t until I cleaned the basement furnace room that I noticed something odd. The old coal chute, sealed decades ago, had faint scratches around its rusted iron door. The scratches looked like tally marks—five groups of four, then a fifth group with three. That’s when I remembered the ledger’s mention of ‘regular patterns.’ I knelt and traced the marks with my glove. They were fresh, the metal beneath the rust barely oxidized. Something had been scratching there recently.

That night, as I finished my shift, I heard the tapping again, but this time it was faster and more frantic, coming from directly beneath my feet. I froze, mop in hand. The sound was coming from the basement, and it was spelling something out. Thump, tap-tap, thump, thump, tap. I counted: one, two, three, four, five. Then a long scrape, like a fingernail dragged across rust. And then silence. I drove home with my heart pounding, but I told Clara it was just the old pipes.

For the next week, I tried to ignore it. I threw myself into my studies—calculus, my weakest subject. But the tapping followed me, growing more insistent. One night, I snapped. I grabbed a flashlight and descended into the basement. The air was cold and smelled of wet earth. The coal chute door was slightly ajar. I hadn’t left it that way. I pulled it open and shone the light inside. The chute was narrow and black, descending into a darkness that seemed to swallow the beam. I saw a glint of metal at the bottom—a small object. I reached in, my arm scraping the walls, and retrieved a tarnished brass key on a ring. It was old, with a bow shaped like a triangle.

I took the key to the second floor, where the classroom doors each had a keyhole. None of them matched. I tried every door, every closet, even the attic. Nothing. Then I remembered the basement had a small door, almost hidden behind the furnace, that I’d never noticed because it was covered with soot. The key fit perfectly. The door creaked open to reveal a narrow spiral staircase leading down into a sub-basement that wasn’t on any floor plan.

The steps were stone, worn by decades of feet. I descended with my flashlight shaking. The room below was small, with a dirt floor and a massive, ancient boiler that looked like a creature from a nightmare. In the corner, a wooden desk held a stack of leather-bound journals. They were Henry’s, decades of custodial notes. The final entry was dated 1952: ‘They want to be counted. They need to be known. But every time I count, they move. I have to start over. Tonight, I will stay until I get it right.’ The last page was blank except for a series of numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10… and then a frantic streak of ink.

I felt a cold breath on my neck. I spun around. The room was empty, but the air shimmered. Then I heard the tapping again, but this time it was all around me, a cacophony of thumps and taps, as if an army of fingers were drumming on the walls. My flashlight flickered and died. In the darkness, I felt a presence—something immense and ancient, waiting. It was counting. It was always counting. It knew I was in its space, and it wanted to add me to its tally.

I stumbled up the stairs, slammed the door, and locked it with the brass key. I ran out of the building and never went back. I quit the job the next morning, claiming a family emergency. But the tapping didn’t stop. It followed me home. I hear it in the walls at night—a rhythmic thump, tap-tap, thump—counting. It’s been years now, and I’ve changed careers, but I still can’t sleep without a calculator and a notepad by my bed, trying to decipher the code. Clara thinks I’m just a math tutor with obsessive habits. But I know the truth: there’s something in that building, still counting, waiting for me to return and face it.

I’ve done the math a thousand times. There were 23 tally marks on the chute. But after I took the key, there should have been 24. The day I quit, I noticed the marks had multiplied. There were 25. Then 26. Each night I hear the tapping, a new mark is scratched somewhere in my mind. I don’t know what it’s counting toward, but I’m terrified to find out.