If you have not heard of this book, you are missing out.
This book contains a huge amount of information on the City above Barakus, and has a very large "sandbox" kind of feel. It does take some GM prep to have a good idea of what happens with which subquests where, but the PCs do not have to anything in "1 true way." I recomend this for starting a new game with new players, as the book is good for describing a new place / culture to PCs.
[5 of 5 Stars!]