No Country for Old Men by Cormac McCarthy
Llewelyn Moss, hunting antelope near the Rio Grande, stumbles upon a transaction gone horribly wrong. Finding bullet-ridden bodies, several kilos of heroin, and a caseload of cash, he faces a choice - leave the scene as he found it, or cut the money and run. Choosing the latter, he knows, will change everything. And so begins a terrifying chain of events, in which each participant seems determined to answer the question that one asks another: how does a man decide in what order to abandon his life?