In Cold Blood is a non-fiction book by American author Truman Capote, first published in 1966; it details the 1959 murders of four members of the Herbert Clutter family in the small farming community of Holcomb, Kansas.
When Capote learned of the quadruple murder, before the killers were captured, he decided to travel to Kansas and write about the crime. He was accompanied by his childhood friend and fellow author Harper Lee, and together they interviewed local residents and investigators assigned to the case and took thousands of pages of notes. The killers, Richard "Dick" Hickock and Perry Smith, were arrested six weeks after the murders and later executed by the state of Kansas, and Capote ultimately spent six years working on the book. When finally published, In Cold Blood was an instant success, and today is the second-biggest-selling true crime book in publishing history, behind Vincent Bugliosi's 1974 book Helter Skelter about the Manson murders.