Based on some 30 years of research on people who claim to remember past lives, this work encompasses the full spectrum of theory and case study on the subject to date. Early in his investigations, Stevenson became aware that some who remember past lives had birthmarks or birth defects that corresponded to wounds, usually fatal, on the person whose life was remembered. Writing as a scientist and a Western medical professional, Stevenson realized that the idea that wounds on a deceased person can influence the embryo of a later-born baby is subversive to many assumptions of modern biology. This work provides as many cases as could be found, worldwide, and is bolstered by numerous photographs.