The world knows the story of young Emmett Till. In August 1955, the fourteen-year-old Chicago boy supposedly flirted with a white woman named Carolyn Bryant, who worked behind the counter of a country store, while visiting family in Mississippi. Three days later, his mangled body was recovered in the Tallahatchie River, weighed down by a cotton-gin fan. Till's killers, Bryant's husband and his half-brother, were eventually acquitted on technicalities...