Truman Capote, In Cold Blood. High recommendations.
But if you're looking for something that, in my opinion, should be REQUIRED Elliquiy reading, it's Richard Zacks' An Underground Education. I have never read a well-researched and documented book that was so unbelievably amusing. He discusses the sex lives of major historical figures, documents lesser-known works of great authors, and rips open the gut of dozens of shady corporate and government operations.