This is book number 8 in the Hap and Leonard series.
Hap and Leonard is now a Sundance TV series starring James Purefoy and Michael Kenneth Williams.
If there's one thing Hap Collins and Leonard Pine like, it's trouble--and they especially like getting paid to find it. So when their friend and sometime boss Marvin Harmon asks the boys to look into a cold-case double homicide, they're happy to oblige. It turns out that both victims were set to inherit some serious money, and one of them ran with an honest-to-goodness vampire cult. The more closely Hap and Leonard look over the crime-scene photos, the more trouble they see. The image of a red devil's head painted on a tree is just the beginning--a little research turns up a slew of murders with that same fiendish signature. And if things aren't weird enough, Leonard has taken to wearing a deestalker cap . . . Will this be the case that finally sends Hap over the edge?