In June 1964, Neshoba County, Mississippi, provided the setting for one of the most notorious crimes of the civil rights era: the Klan-orchestrated murder of three young voting-rights workers, James Chaney, Michael Schwerner, and Andrew Goodman. Captured on the road between the towns of Philadelphia and Meridian, the three were driven to a remote country crossroads, shot, and buried in an earthen dam, from which their bodies were recovered after a...