Paths of the Damned: Forges of Nuln is the third installment of an epic adventure to tie into Warhammer Fantasy Roleplay. In addition to the adventure itself, this book also contains a full description of Nuln, including a detailed city map and descriptions of neighborhoods, key NPC's (non-player characters) and a host of important locations.
The adventure reads better as fiction than it plays as roleplaying. I GM'd Ashes of Middenheim this and my players were quite happy for it to end, I never finished this series. The details about Nuln are great, and take up about half the book.