No Country for Old Men by Cormac McCarthy (2005)

Another morality tail from this known author. Set in 1980 in Texas, Moss, the Vietnam veteran, picks up the cash from a drug deal went wrong, and things are going downhill from there for him. The sheriff of this quiet Texas county, who has sympathy for Moss and his young wife, tries to help him (and save his life). But these are different days now (partially because of the imprint of the Vietnam war on the society), even the problems of the schools are facing changed for the worse. The violence escalates, as both sides of the drug deal hunt for Moss and each other, only one in person involved in the deal survives at the end, a psychopath contract killer. This is not the good old days, and considering the amount of cash changing hands in these deals, there is no way going back to them.