Borlú opens his eyes. He breached, and now he's under Breach control. If Mahalia and Katrynia discovered that there is a third city, that would leave the cities at war. Breach want to know about Orciny. They want Borlú to find the true link between Mahalia, Bowden and Borlú's subversive wife.
When the body of a foreign student is discovered in the streets of the down-at-heel European city-state of Beszel, it's just another day's work for Inspector Tyador Borlu of the Extreme Crime Squad. But he uncovers evidence that the cuddled girl came from Ul Qoma, a city that shares a dangerous and volatile relationship with Beszel, and this case will challenge everything Borlu holds dear.
The two cities have differing societies, cultures, technologies and language, yet co-exist in the same geographical space. The separation is achieved by the residents of each city "unseeing" the other, while being aware of it, and the separation is enforced by a shadowy organization called Breach. While crossing the border is possible (after a lengthy re-orientation process), those who "breach" the separation illegally are taken by Breach and disappear forever.
The City & The City - Breach Synopsis and Schedule