This was an excellent book. Literally breathtaking. Book 2 branches over into the supernatural more than the first one, but it's done in an interesting and believable way...if the idea of walking death can be believable. However, I think in this novel it is, although I'm still uncertain if the main character, Matt Cahill, has figured out yet whether he's good or evil. It's clear from the reader's point of view which one he is.
This story is about a man in search of his own identity. He went through a near death (and possibly just death) experience in the first book and he's trying to figure out exactly who he is and what his purpose is in this second book. This leads him on a search to an insane asylum where he wishes to interview a man who went through the same thing that he did in hopes of unraveling this mystery.
This series is a must read for anyone interested in mysteries, thrillers, or horror. The main character is trying to save the world and himself, one decaying corpse at a time, who could ask for more?