Were it not for Truman Capote, the world would never have had Breakfast at Tiffany's, which was based off of the author's 1958 novella. Fortunately for us, Capote was far from a one-hit wonder and took a stab at what he referred to as a "nonfiction novel," with his 1966 In Cold Blood. The book details the murders of the Clutters, a family of four who worked on a farm in Holcomb, Kansas in 1959. Capote was very thorough and he, along with childhood friend and To Kill a Mockingbird author, Harper Lee, ventured to Kansas and personally conducted interviews to get details of the crime, making it (literally) scarily accurate.
