Cold in July - Joe R Lansdale

To kill a man, even in self-defence, is no easy thing for a man with a conscience. He has to answer to himself, put the episode behind him, get on with his life. This is very difficult when the dead man's father, a murderous ex-con, is determined to avenge the shooting, no matter what the rights and wrongs.

Richard Dane is a small businessman, a family man with a son of his own. Ben Russell, the ex-con, has a very simple proposition: an eye for an eye, a son for a son. But the truth is anything but simple, and before long Dane and Russell, misled and manipulated, are awkward allies in a living nightmare of paranoia and psychopathic sex, violence and corruption.