Professor Nivor Caul has spent thirty-one years cataloguing the tax rolls of dead economies. He trusts ledgers the way other men trust scripture — until the morning one shows a payment received a fortnight before it was due. What follows is not a mystery to be solved. It is an account to be properly read. At a university with no founding date, buildings grow extra floors overnight, libraries rearrange their own shelves, and a cathedral appears, fully formed, in the middle of a lake. Nivor's own book has grown chapters he never wrote, in a hand disturbingly like his own. When an underground archivist shows him a wall old enough to have forgotten its own name, Nivor understands: reality is not a place. It is an archive. And it has been quietly, patiently revising itself for longer than any civilization has kept count. Guided by a cartographer whose maps arrive before the ground does, a woman who ages by geography instead of by calendar, and the growing certainty that he has been chosen — deliberately, for reasons no one will yet explain — Nivor sets out across a country where bridges refuse to be crossed, staircases argue with themselves, and a debt older than history is finally coming due. At the very bottom of everything waits a single book whose title changes every second, and a truth Nivor is not prepared for: the book is not being read. It is reading him. For readers of Piranesi, House of Leaves, and Borges — a work of literary weird fiction about memory, testimony, and what it costs to be properly, honestly seen.