In June 1920, in Duluth, Minnesota, a mob of over 10,000 convened upon the police station, inflamed by the rumor that black circus workers had raped a white teenage girl—charges that would later be proven false. Three men were dragged from their cells and lynched in front of the cheering crowd.<br /><br />More than eighty years later, Warren Read—a fourth-grade teacher, devoted partner, and father to three boys—plugged his mother's maiden name...