Sourcebook describing in detail the city of Detroit, its inhabitants and customs in 2050.
From the back of the book (translated by user):
First of the Nationbooks - supplements that describe in detail 11 main places of origin for Neuroshima characters. "Detroit" and published earlier "Wyścig" tells the story of the same city, but the first one gives players and Game Master more information to use on sessions. This book covers history of the city, culture, people in charge, gangs and organizations.