On June 17, 2015, 12 members of the Emanuel AME Church in Charleston, South Carolina, welcomed a young white man into their evening Bible study. He arrived with a pistol, 88 bullets, and hopes of starting a race war. Dylann Roof then murdered nine people during closing prayer. A Pulitzer prize-winning journalist captures the tragedy and its stirring aftermath. 352 pages, hardcover. St. Martin's.