From the back of the book:
The crumbling walls of Bergholt sit astride a transhipment point between the far-flung realms to the east and west. The citizens of this backwasj consider themselves free of the chaos of the world. This myth rests well with those weary travelers seeking respite from the horrors of the trail and the vile intrigues of the lands. But villainous deeds are afoot beneath the veil, luring adventurers to journey Bergholt's dark streets in pursuit of answers and a common thief.
This d20 System Companion Book begins the "Dens og Iniquity" campaign backdrop. Set in the World of Inzae, it continues the story of the "Death on the Treklant" trilogy, or stands alone as the first part of an intriguing city adventure. With over 46 encounter areas, cultural and historical background information, new weapons, and new skill interpretations, this sourcebook is perfect for DMs and players seeking the thrills of gritty urban adventure.