Glass Arithmetic

Chapter 1: Proof

The package arrived on a Tuesday, which was already wrong. Tuesdays were for nothing. Tuesdays were the blank spaces between the weekend’s silence and the week’s small demands—office hours, a faculty meeting she would not attend, the particular hum of the mathematics building’s ancient boiler. Tuesdays were the days Mira allowed herself to believe that the world had, at last, forgotten her.

The knock came at 11:47. She knew the time because the grandfather clock in the hallway—her father’s, a monstrosity of oak and brass that she kept wound out of spite—had just finished its eleven chimes, and she had counted the minutes since by the rhythm of her own breathing. Forty-seven breaths, give or take. She was standing in the kitchen, her fingers resting on the edge of the counter, tracing the grain of the wood that she had memorized years ago: the small knot near the left corner, the shallow groove where someone—a previous tenant, a ghost—had dragged a knife.

The knock was not a knock. It was a thump, heavy and deliberate, followed by the scrape of something being set down. A package, she thought. Large. The sound of cardboard against the worn bristles of her doormat was unmistakable.

Mira did not move immediately. She listened instead, the way she always listened, letting the sound settle into the room’s acoustics. The knock had been low, resonant—a man’s fist, or the flat of a hand. The footsteps that followed were soft, receding. Not a