For more than a century, the enduring feud between the Hatfields and the McCoys has been American shorthand for passionate, unyielding, and even violent confrontation. Yet despite numerous articles, books, television shows, and feature films, nobody has ever told the in-depth true story of this legendarily fierce-and far-reaching-clash in the heart of Appalachia. Drawing upon years of original research, including the discovery of previously lost and...