"Frankie Elkin is an expert at finding the missing persons that the rest of the world has forgotten, but even she couldn’t have anticipated this latest request--to locate the long-lost sister of a female serial killer facing execution in three weeks’ time. She has called herself 'death,' but people called her the devil. The case was sensational. Kaylee Pierson had confessed from the very beginning, waived all appeals. Despite the media’s chronicling...