Kai Voss has spent his entire life not looking too closely at things.As a cartographic clerk in the Citadel, he is very good at this. The city has wrong places — districts where shadows move incorrectly, streets that are older than their own records, a vast chasm beyond the Wall that nobody maps past the edge of. Kai documents these things with precise, professional distance and does not ask what they mean.Then he touches an artifact from an anomalous zone and loses the ability to look away.Now he can see what has always been there: a cosmic presence pressing at the world from outside, threading wrongness through every surface and shadow in the city. He can see it in the walls, in the streets, in the people around him. And it — whatever it is — can see him.With the Concordance’s collectors closing in, Kai descends into the Gap with a network of others who can see what he sees. What he finds there is worse than he expected: a plan three hundred years in the making, forty-nine prisoners in a facility beneath the city, and a clock counting down to something that nobody has a good answer for.