The Sunroom’s Arithmetic

Our mother used to say that the three of us were born with a caul, though I never saw it. She had her own peculiar gifts—she’d often know when the phone would ring or who was on the other end. But my twin, Daniel, was the real channel. Martin, my other brother, was the skeptic, the one who’d choke on his own fear if he admitted it. He’d seen things, maybe more than any of us, but he’d built his entire life on denial. That’s why what happened in that bungalow in the mid-2000s is so fitting.

Martin’s a single dad, raising his son, Liam, who was about ten at the time. They’d moved into a modern bungalow on a brand-new estate, a cul-de-sac of identical cream houses with red-tiled roofs, barely ten years old. The kind of place where nothing bad could happen, because it was all fresh and clean. The interior was open-plan: you entered into a spacious living area with a kitchen to the right, separated by a breakfast counter, and an L-shaped hallway led to the bedrooms. Martin chose it for the light, the newness, and because it was a short walk to our dad’s place. He was determined to give Liam a stable, ordinary life.

Ordinary lasted about a month. Liam started having night terrors. He’d scream in his sleep, thrashing, calling out in a voice that didn’t sound like his own. Martin would rush in, but Liam would be sitting up, eyes open but unseeing, mouthing syllables that weren’t quite words. The doctors said it was nightmares, stress from the move. But Liam’s behavior changed during the day too. He’d sit at the breakfast counter, staring at the kitchen clock, muttering numbers. At first, Martin thought it was a game, but Liam kept saying things like, ‘Three minutes and forty-seven seconds,’ or ‘Fourteen times twenty-three equals three hundred twenty-two.’ He was eerily accurate, but it was nonsensical.

Then the kitchen clock started running backward. It was a digital clock, a cheap one from the hardware store. Martin would set it, and the next morning, it would be showing the time in reverse—not just moving backward, but the numbers themselves were reversed, like a mirror image. He replaced it, but the new one did the same. He threw it out, and the spot where it sat on the counter began to feel cold, a pocket of chill that followed you if you stood there too long.

Martin, true to form, told himself, ‘That didn’t happen.’ He bought a clock without a display, a simple analog one, and put it on the counter. The hands spun wildly at night, eventually snapping off and landing on the floor in the shape of a ‘V’.

The house itself began to change, almost imperceptibly. The hallway, which was L-shaped, started feeling longer. Liam would walk to his bedroom, and it would take him an impossible amount of time. Martin would time him with his watch, and it would take twenty seconds, but from the kitchen, it looked like thirty, or forty. The proportions were off. One day, Martin measured the hallway with a tape measure, and it was exactly twelve feet, as per the floor plan. But when he walked it, his footsteps echoed oddly, as if the space were double its length.

Then the math started. Martin found a notepad on the kitchen counter with equations written in a neat, unfamiliar handwriting. They were complex, like calculus, but with nonsensical variables. ‘If x is the shadow of a man at noon, what is the quotient of his absence?’ Martin tore it up and threw it away. But the next day, the equations reappeared, this time on the walls, in faint pencil, creeping from the hallway like ivy.

Liam’s night terrors now had a specific content. He’d say, ‘The sunroom is getting bigger,’ but there was no sunroom. The bungalow had a small, glass-enclosed porch at the back, filled with potted plants and a wicker chair, but it was just a nook. Liam started refusing to go near it, saying ‘It doesn’t fit.’

Daniel, my twin, came to visit. He’d always been sensitive, but he cringed the moment he stepped through the front door. He said he felt like he was being watched, not by something in the house, but by the house itself. He walked the layout, his fingers trailing along the walls, and stopped at the breakfast counter. He said, ‘There’s something wrong with the angles.’ He measured the counter with his hands, frowning. ‘It’s crooked. Not physically, but like the geometry is off.’ He put a level on it, and it was perfectly straight.

That night, Daniel stayed in Liam’s room. He woke in the middle of the night to a faint humming, like an old computer, coming from the kitchen. He found Martin already there, staring at the counter. A pool of light from the streetlamp through the window formed a perfect circle on the floor, but the shadow of the counter fell at an angle that contradicted the light source. They both knew it, but Martin said, ‘It’s just the moon.’

The next day, Daniel helped Martin clean out the glass porch. They moved the pots and the wicker chair, and behind a stack of old boxes, they found a small door, painted to match the wall, that Martin swore had never been there. It was about two feet high, like a crawlspace, but when they opened it, there was no dark hole—instead, a narrow corridor extended, perfectly lit, with white walls and a polished floor. It stretched farther than the bungalow’s dimensions should allow. Liam was standing behind them, looking in, and he said calmly, ‘It’s the sunroom’s arithmetic.’

Daniel tried to step inside, but Martin grabbed his arm. ‘Don’t,’ he said, his voice tight. But Liam walked past them, ducking into the corridor, and they followed, unable to stop him. The corridor turned, and turned again, leading into a large room that was exactly the size of the entire bungalow—the living area, the kitchen, the hallway, the bedrooms—but mirrored. The ceiling was a perfect reflection of the floor, and the walls were covered in equations, not just mathematical but grammatical, combining numbers and letters in impossible ways. At the center stood a child’s desk, and on it, a single notebook. Liam picked it up and opened it. The first page read: ‘The sunroom has always been here. You just didn’t see it.’

They turned to leave, but the corridor behind had vanished, replaced by more walls of equations. Daniel started breathing heavily. Martin, for the first time, let the fear show. But Liam looked up, his eyes wide and clear, and said, ‘Dad, I think we have to solve the problem.’

For three hours they worked on the equations, using Liam’s compulsive numbers as keys. They found that each equation, when solved, removed a section of the mirrored walls, revealing paths back to the real house. Finally, only one equation remained, written in blood-red ink: ‘If you divide the family by zero, what remains?’

Martin looked at Liam and Daniel, and without a word, he picked up a marker from the desk and wrote, ‘Each other.’

The walls dissolved, and they were back in the bungalow, standing in the living room, the afternoon sunlight streaming in. The glass porch was normal, no door. But the kitchen clock was running forward again. They never spoke of it. Daniel left the next day, and Martin told himself that it had all been a shared hallucination, brought on by the stress of moving. He threw away the notebook, but Liam kept a single page, folded in his pocket. He still has it. On that page is the answer to the last equation, in Martin’s handwriting: ‘Each other.’ And underneath, in a child’s hand, ‘But zero is the sunroom.’

Liam is sixteen now, and he still sleeps with a nightlight. Martin, whenever he passes a bungalow on a cul-de-sac, walks a little quicker. But he’s never told anyone what the sunroom actually was. He just says, ‘That didn’t happen.’ Though sometimes, late at night, he’ll hear Liam counting in his sleep, and the numbers don’t add up.