Last October, during a dreary Tuesday morning, I sat in my environmental science class, which was held in a temporary modular unit at the back of the school. The unit was always stuffy, the heater blasting even when the autumn sun streamed through the six long windows. We were watching a documentary on climate change, the lights dimmed, and I was absently sketching a spiral in the margins of my notebook. I hadn’t slept well the night before, but I was far from drowsy; I was alert, tracing the curve of my pen.
About ten minutes in, a chill ran down my spine. It was not the kind of shiver from a breeze; it was a sudden, deep cold that settled in my bones, like a hand pressing against my back. I rubbed my arms, thinking maybe the AC had kicked on, but the vent above me was blowing warm, stagnant air. I looked around at the other students, all of them leaning back in their chairs, some dozing, none seeming affected. I tried to focus on the screen, but the cold persisted, growing sharper as the minutes passed.
I turned my attention to the windows. There were six, three on each side of the trailer. The one diagonally across from me, near the front, caught my eye. The glass was fogged in a corner, but not from the outside. A thin layer of condensation was forming on the inside of the pane, as if the cold was emanating from within the room itself. I stared at that window, and behind the documentary’s narration, I thought I heard a faint tapping, like the clicking of fingernails on glass, but no one was near it. I wrote it off as the heater’s rattle.
Then the cold became oppressive. It felt as if an Arctic draft was blowing directly at my neck, and I turned to see if the door had opened. It hadn’t. But I noticed something odd: the calendar on the wall, usually bright with pictures of animals, showed the date as October 12th. But when I looked closer, the numbers were smudged, rearranged into a single, repeating digit – 13. I blinked, and it was back to 12. A trick of the light, I told myself.
I tried to distract myself by taking notes. I wrote ‘carbon dioxide levels rising’, but my hand moved on its own, scrawling a sentence I didn’t intend: ‘the window counts your breaths.’ I immediately crossed it out, my heart pounding. I glanced up at the window again. The condensation had spread, forming a faint outline of a face, but not a human one – it was elongated, with hollow eyes. I looked away, focusing on the documentary, my mind racing.
The tapping grew louder, now coming from all six windows, a synchronized rhythm like a heartbeat. I put my hands over my ears, but the sound seemed to come from inside my head. The chill was now a full-body freeze, and I could see my own breath misting in the warm air. The other students were oblivious; the girl next to me was chewing her gum lazily, the teacher was nodding off.
Suddenly, the documentary cut to a scene of a glacier calving, and the sound of cracking ice filled the room. That’s when I saw it: on the window in front of me, the condensation had written a message in reverse, like it was meant to be read from outside. It said, ‘LET THE LAST ONE OUT.’ I felt a jolt of pure terror. I knew that whatever was in the room was trying to get out, and it had chosen me as its instrument.
I shot up from my seat, my chair scraping loudly, and bolted for the door. I didn’t look back. I ran down the short hallway of the trailer, pushed open the exterior door, and stumbled into the crisp autumn air. The cold vanished instantly, replaced by the warmth of the afternoon sun. I stood there shaking, gasping for breath. When I finally looked back at the trailer, through the window, I could have sworn I saw a dark shape retreating from the glass, and the windows were clear.
I have never set foot in that trailer again. They replaced it at the end of the year, saying it had structural issues, but I know it was more than that. Sometimes, when I walk past a row of windows, I catch a glimpse of my own reflection, but for a split second, it seems too long, and my breath fogs the glass even when it’s hot outside. And I remember what it wrote – ‘LET THE LAST ONE OUT.’ It’s not about the one who leaves; it’s about the one who stays behind, waiting to be freed. I still have that notebook, and on the last page, in handwriting that isn’t mine, it says, ‘You were the first. I’m patient.’