Seeing that the writer is an ordained Baptist minister, suddenly everything makes so much more sense.
My favourite parts of this series? When the author breaks down anthropological/sociological concepts for the lay person. He is clearly well studied/researched, and he presents information in a really interesting way. (Full disclosure, I did my undergrad in anthropology, maaany years ago, haha, but I really enjoyed it, especially the courses I took in paranormalism, and religion, magic and witchcraft. I was lucky, though, to have excellent professors who were nothing like the protagonist!)
The mystery in this installment was good and spooky. Not the ghost stuff, but the "what horrible thing did they do?," and the creeping unease that permeated. When it was revealed, I was overwhelmed with righteous indignation, heh. No, seriously, though, I was mad, and even more so when one particularly hateful character didn't get the ending I'd hoped. Aargh.
Of the three I've read so far, I enjoyed the mystery in this one the most. It was well developed with a villain who had an interesting and believable (and tragic) backstory.