I enjoyed this very much. Emson puts an interesting spin on the possible starting point of the vampire mythos. The writing is punchy and could have used a little polishing - I imagine he'll improve with in later books. The publishers are a new company and unfortunately there are quite a few grammatical/spelling errors. I noticed at least 3 and that kind of thing drives me mad, but I'm probably just picky. The characters are extremely believable, which is something I look for in a novel, and I felt for them a great deal.
And it gave me nightmares, which is always a compliment for a horror novel.