My sole contribution to this book was the opening vignette, about Blandine and Uriel. I introduced the Tsayadim into In Nomine canon.
This was a good, atmospheric book, but its main contribution was expanding on Blandine and Beleth and the Marches (and most of this material was later reprinted and revised with the Ethereal Player's Guide
). The adventures were rather... pointless. Supposedly this was a part of the Revelation Cycle, but it was almost incidental and had little to do with the campaign arc.