Two families mysteriously murdered under similar circumstances, just a month apart. One was memorialized in Truman Capote's classic true crime novel, In Cold Blood. The other was all but forgotten. Dick Hickock and Perry Smith confessed to the first: the November 15, 1959 murder of the Clutter family of four in Holcomb, Kansas. Despite remarkable similarities between the two crimes, Hickock and Smith denied committing the second: the December 19 murder of the Walker family of four in Osprey, Florida. Over half a century later, a determined Florida detective undertakes exceptional efforts seeking to bring closure to the long-cold case.