This is a great book.
It is very creative, and adds great depth to this misunderstood Bloodline.
My only gripe, and it's a big one, is that this book is only for Vampire: Dark Ages. While the concept is interesting, I think it would have been much more interesting to set the book in modern times so that we know what the Bloodline is up to as Gehenna approaches. Specifically, it would be great to know what the Salubri antitribu and the hidden Salubri Healers were doing.
Besides the setting, I highly recommend this book.