Truman Capote's In Cold Blood, besides being a lit nerd's complete dream (he researched with Harper Lee, for Pete's sake) is still the best true-crime novel, defining the genre. In investigating the murder of an entire family of four, Capote's retelling of the story makes the murders relatable if not sympathetic, and gives the reader a sense of how random and senseless so many murders seem to be.Capote's powerful retelling of the story is a must-read, even if you don't normally like reading about murders. Books from Vincent Bugliosi and Curt Gentry's Helter Skelter to Melanie Thernstrom's The Dead Girl owe a debt to In Cold Blood.