It's late October in Hurleyville, a small town in upstate New York where the leaves have gone brown and the cold seeps through every crack. Luna tells the story of Dale, a second-shift janitor at the old county courthouse, who noticed a door one night that he'd never seen before — a narrow steel door set into the back wall of the boiler room, painted the same grey as the concrete. He figured it was just a storage closet he'd overlooked. But the lock was a heavy padlock, old and rusted, and when he finally got it open one night out of pure curiosity, he found a short hallway that led to another door, and then another, and then a room that should not have existed within the building's footprint. A room with no windows, no vents, and a single wooden chair bolted to the floor. And on the chair, a notebook with handwriting that started fresh and ended in a frantic scribble. What Dale found in that notebook, and what he heard through the walls afterward, is the kind of thing that makes you stop checking dark corners altogether.