Virgil A. Stewart happened to be in the right place at the right time. In January 1834, he offered to help a friend in Madison County, Tennessee track down two missing slaves who were believed to have been stolen by a local thief named John A. Murrell. Posing as a man looking for a lost horse, Stewart won Murrell's confidence over the course of several days and the thief shared with him stories of his exploits and revealed various criminal acts he had committed, including robbery, slave stealing, and murder. Murrell also admitted to being the leader of a vast criminal empire with one thousand...