Prospector Amos Warren and Big Bad John Lassiter, his young protege, were as close as father and son until a violent argument tore them apart. The next day, Amos disappeared, never to be seen again. Years later, his bones were found in the desert. All signs pointed to John Lassiter, and Detective Brandon Walker made the arrest in the case.Now, more than four decades later, the retired Walker is called in to look into the killing. Lassiter's daughter, Amanda Wasser, wants Brandon and TLC to find Amos's "real" killer and clear her father's name.Brandon Walker's search to find the truth about Amos's killer eventually leads to an unsolved murder that could be connected to the case. Then Brandon gets in touch with crack investigator J. P. Beaumont. Soon, these seasoned detectives must pool their personal and professional expertise when someone close to Brandon falls into the hands of a cold-blooded killer involved in a recent multiple homicide-who may also hold the key to the cold case.