The Arithmetic of Missing Things

I’ve never believed in ghosts. Not really. Old houses creak, pipes knock, and the wind does strange things against glass. That’s what I told myself when my friend Mira lived with us in our split-level in the suburbs, a place as unremarkable as a beige carpet. Mira, though, she had a way of noticing things. She’d talk about ‘presences’ and ‘energy’ with such calm certainty that I couldn’t help but listen, even while I chalked it up to her vivid imagination.

When Mira moved out, I thought the chapter was closed. A few weeks later, she called me, her voice strained, hesitant. ‘Did you ever… experience anything in the house?’ she asked. I laughed, said no, asked why. She paused so long I thought the call had dropped. Then she told me about the arithmetic.

It started when she was home alone, folding laundry in the living room. The TV was on low, but the sound of a pencil scratching on paper cut through the noise. It came from the study, a small room we used for bills and my half-finished novel. She ignored it, blamed it on the heating vents. But it kept happening, always when she was alone, always at the same time—just after the clock in the hall struck three.

One afternoon, driven by curiosity, she peeked into the study. The room was empty, but on the desk, perfectly aligned, was a stack of scrap paper. On the top sheet, in handwriting so neat it looked printed, was a sum: 17 + 4 = 21. She frowned. It was so ordinary, so mundane, that it unsettled her more than a ghostly figure would have. She crumpled the paper and tossed it in the bin.

The next day, a new sheet lay on the desk: 31 – 14 = 17. Then a multiplication: 6 x 8 = 48. Each day, a new, correct equation. She started leaving a pen out, hoping to see the hand that wrote them, but nothing appeared. The sums just materialized, always during her alone time.

Then they changed. The equations became personal. She found a page with her name, her birth date, and a string of numbers that looked like a countdown. She confronted me, asking if I’d been playing a prank. I swear I hadn’t. I was as baffled as she was. But something in the air of that house had shifted, and I couldn’t shake the feeling that the numbers were leading somewhere.

The day she moved out, she left a note on the study desk, a final equation: 42 / 7 = 6. I didn’t understand it then. It was just a number.

Months passed. The study stayed closed, and I forgot about Mira’s strange stories. Then one Tuesday, I was home alone with a fever, drifting in and out of sleep. At three in the afternoon, the clock in the hall struck, and I heard it—a soft, rhythmic scratching. From the study.

My heart seized. I told myself it was the settling of the house, the same excuse I’d given Mira. But the sound was insistent, like fingernails on a chalkboard. I pulled myself up, my limbs heavy with sickness, and pushed open the study door.

The room was dim, the blinds half-drawn. On the desk, a single sheet of paper lay under a pen. The ink was fresh. The equation read: 14 – 1 = 13.

I stared at it, my breath catching. 13. The number of my old apartment, the one I’d fled after a bad breakup. The number of days I’d spent in the hospital last year, when a routine surgery went wrong. The number of letters in my full name—a name I never used. It was as if the house was mining my life for numbers, for patterns, for meaning.

A wave of dizziness washed over me. I leaned on the desk, knocking over a pile of old receipts. As I bent to pick them up, I saw something taped to the underside of the desk—a small, yellowed index card, covered in a long list of equations, each one crossed out. At the top, in the same neat handwriting, was the date of a day I tried to forget: the day my father walked out, leaving my mother and me to fend for ourselves. The equations below were all variations on a theme: 2 + 1 = 3, 3 – 1 = 2, 1 x 1 = 1. They were all calculations of absence, of how to subtract people from a life.

I realized then that the house wasn’t haunted by a ghost. It was haunted by the mathematics of loss. It was calculating, always calculating, the exact coordinates of my grief, and it wanted me to know that I was just a number, a variable in an equation I couldn’t understand.

I fled the house that day, and I never went back. I sold it to a young couple who started a family. I never told them about the study, about the sums that appear when you’re alone, about the scratching that sounds like a pencil moving toward a final, terrible answer. Sometimes, late at night, I do the math on my own life. I add up the people I’ve lost, subtract the years of joy, multiply my fears, and divide my hopes. And every time I get the same result: the house is still out there, waiting, and I am just one more row in its endless ledger.