The instant her phone rang, Reverend Sharon Risher sensed something was horribly wrong. Something had happened at Emanuel AME Church, the church of her youth in Charleston, South Carolina, and she knew her mother was likely in the church at Bible study. Even before she heard the news, her chaplain's instinct told her the awful truth: her mother was dead, along with two cousins. What she couldn't imagine was that they had been murdered by a white...