The Riveted Sky

Tavish Larn was born on a floor with a riveted sky, in a parish that pays its tithe in oil, and he has one talent the Guild has no use for: he can hear the hinges.

The Fifth Floor runs on two lamp suns, the Gilt and the Cinder, riding rails across a ceiling of iron. Once in a generation the world turns, and parishes that cannot move are fed to the seams. The Guild of Lamplighters promises that the Turn is coming, that the lamps are tended, and that the tithe keeps the light burning. The Guild's paper says all of it. The ground under Tavish's boots says something older, and it says the dates are a lie.

His father gave him the truth in a kit: a listener's rod to hear the plates, walker's chalk to mark what is made instead of grown, and a hide map of a wall no warden is supposed to open. Then Garrick Larn walked into the deep galleries on a survey the Guild struck from its books, and never came home, and the kit made the boy the last walker on the floor.

Now the countdown under the marsh is running out nine years early. Houses are going onto sleds. Bell codes are being drilled into children and soldiers. And behind the long wall, in a gallery the map was drawn to hide, Tavish finds an engine that has been drinking his parish's tithe for nine years, a ledger initialled by the Guildmaster, and a trail of tin cups, numbered and dated in his father's hand, marked for a son to follow.

The trail ends at the hinge-heart, where three plates the size of counties meet around a keeper's desk, and the desk is occupied. The oldest machine on the floor has been asking one question for nine hundred years: WHO OWES THE LIGHT? Nine years ago the Guild answered it with a lie, and the floor has been paying interest ever since, in oil, in stone, and now in the light of the suns themselves.

To pay a hinge you need three things: an answer that is true, a record to prove it, and a debtor with the standing to surrender. Tavish has two of them, and his father has kept the readings for nine years in the dark. The third is a Guildmaster arriving under a truce flag with his charter in his fist, ready to end the oldest fraud on the floor, if the parish will let him live long enough to confess.

And above the hinge-heart there is a stair the camps never take. At the top of it: a window in the world's own ceiling, barred from the far side, closed three hundred years ago for a term of one hundred years. The lamps were lit to make everyone forget it. The parish's own bell book holds the code that opens it.

A wall walker's son with a rod and chalk. A hermit with a burned account. A bell ringer with a code for staying. A garrison captain who signed the parish roll as a hauler. They are going to answer the question, open the shutter, and find out what has been reading at the top of the sky.

The sky has rivets. It also has a way out.