Hap Collins and Leonard Pine novels

"Hap Collins and Leonard Pine return in a red-hot, mayhem-fueled thriller to face a vampire cult, the Dixie Mafia, and the deadliest assassin they've ever encountered--Devil Red. When their friend Marvin asks Hap and Leonard to look into a cold-case double murder, they're more than happy to play private investigators: they like trouble, and they especially like getting paid to find it. It turns out that both of the victims were set to inherit serious...

Roughneck detectives Hap Collins and Leonard Pine take on an apparently straightforward assignment -- discourage a man from harassing his estranged wife -- that is, until the husband is murdered and more bodies turn up.

Mismatched private detectives Hap and Leonard investigate the murder of a young black man who was conducting his own civilian investigation into the white cop who was stalking his sister.

Unlikely partners Hap and Leonard save a woman from a mob hit, only to find themselves confronted by an adversary who challenges their friendship.