I'm a bit sad if truth be told. I've waited for ages for this book to come out and then read it in a day.
Picking up shortly after the events of 'Thicker Than Water', we find Castor being torn between self-pity and self-loathing. Having taken to the bottle, he is almost prepared to give up on everything, until enemies and friends conspire to drag him out of his funk.
Asmodeus/Rafi are on the run, causing random acts of savagery and havoc, Juliet is going mental, and human enemies are all over him...
I won't go into detail about the plot as it would spoil the ending, and seeing as there is one more book left (according to Carey), it may give you clues as to who/what his nemeses (plural) may be.
Excellently written, we get a feel for Castor, a laconic, sarcastic and down at heel exorcist with a clear sense of morals in a world that is being torn apart. The support sharacters are well drawn out too, from his undead version of Huggy Bear, to the new allies he amasses.
Possibly best read immediately after 'Thicker Than Water', this is the best book in the series by far and when Carey finally does finish up, I can only hope his next hero/anti-hero is as well realised as Felix Castor.