"In 1948, in the most stubbornly Dixiefied corner of the Jim Crow south, society matron Idella Thompson was viciously murdered in her own home: stabbed some hundred and fifty times with pruning shears, she was left face-down in one of the bathrooms. Her daughter, Ruth Dickins, was the only other person in the house. She told authorities a Black man she didn't recognize fled the scene, but no evidence was uncovered. When Dickins was convicted and sentenced...