The slaying of three civil rights workers in Philadelphia, Mississippi, in 1964 was a notorious event documented in Howard Ball's 2004 book Murder in Mississippi. Now Ball revisits that grisly crime to tell how, four decades later, justice finally came to Philadelphia. Originally tried in 1967, Baptist minister and Klansman Edgar Ray Killen was set free because one juror couldn't bring herself to convict a preacher. Now Ball tells how progressive-minded...