Subtle and Dangerous aptly describes the folk magic of the story. It feels different from the folk magic I am familiar with, but that regional differences for you. Still I like how you cannot be quite sure if its magic or something else (luck, drugs, the usual suspects).
It is a Hero's Journey adventure, complete with a trip to the Otherworld and a return to life (Very Joseph Campbell). I really, really liked that the protagonist had none of the oh-too-typical aversion to killing and revenge we get shoved down our throats! None of this “We cant kill them, we would be no better than they are if we do.” Crap.
I am looking forward to reading more by Mr. Miller, and if I could be so bold as to suggest perhaps his next book feature a female lead (say Katy – maybe she has a fiddle duel with the Devil come back for Preston? I am a sucker for fiddle duels with the devil – big CDB fan that I am).