From the back of the book:
Runner Havens - The first core setting book for Shadowrun, Fourth Edition - introduces the players to two of the world's premier shadowrunner sprawls: Seattle and Hong Kong. Each city is described in detail from a shadowrunner's point of view, covering key topics such as the balance of power, corporate and underworld affairs, places to see, strange magics, and key features of interest. A wealth of plot hooks are also included. Four other runner-favored cities - Cape Town, Caracas, Hamburg, and Istanbul - are also covered, and gamemaster advice is provided for transforming any specific urban locale into a shadow haven.