In Cold Blood is a non-fiction novel by American author Truman Capote, first published in 1966. It details the 1959 murders of four members of the Clutter family in the small farming community of Holcomb, Kansas.

Capote learned of the quadruple murder before the killers were captured, and he traveled to Kansas to write about the crime. He was accompanied by his childhood friend and fellow author Harper Lee, and they interviewed residents and investigators assigned to the case and took thousands of pages of notes. Killers Richard Hickock and Perry Smith were arrested six weeks after the murders and later executed by the state of Kansas. Capote ultimately spent six years working on the book.

Herbert "Herb" Clutter was a prosperous farmer in western Kansas. He employed as many as 18 farmhands, who admired and respected him for his fair treatment and good wages. His two elder daughters, Eveanna and Beverly, had moved out and started their adult lives; his two younger children, daughter Nancy, 16, and son Kenyon, 15, were in high school. Clutter's wife Bonnie had reportedly been incapacitated by clinical depression and physical ailments since the births of her children, although this was later disputed by her brother and other family members, who maintained that Bonnie's depression was not as debilitating as portrayed in the book.

Two ex-convicts recently paroled from the Kansas State Penitentiary, Richard Eugene "Dick" Hickock and Perry Edward Smith, robbed and murdered Herb, Bonnie, Nancy, and Kenyon in the early morning hours of November 15, 1959. A former cellmate of Hickock's, Floyd Wells, had worked for Herb Clutter and told Hickock that Clutter kept large amounts of cash in a safe. Hickock soon hatched the idea to steal the safe and start a new life in Mexico. According to Capote, Hickock described his plan as "a cinch, the perfect score." Hickock later contacted Smith, another former cellmate, about committing the robbery with him.In fact, Herb Clutter had no safe and transacted essentially all of his business by check.

After driving more than 400 miles across the state of Kansas on the evening of November 14, Hickock and Smith arrived in Holcomb, located the Clutter home, and entered through an unlocked door while the family slept. Upon rousing the Clutters and discovering there was no safe, they bound and gagged the family, and continued to search for money, but found little of value in the house.