Honest but mistaken eyewitnesses are the leading cause of wrongful convictions in the United States. As the innocent go to prison their lives are shattered; as the criminal goes free, the public remains vulnerable. With a vivid cast of brilliant scientists, street-wise cops, and former prosecutors—all haunted by the legacy of wrongful convictions, some directly involved with one—Doyle sheds light on the intersection of personal ambition, legal and political principles, and scientific inquiry. He highlights real possibilities for improved identification, their challenges to the legal tradition, and persuasively argues that the promises of improved justice must be realized before another wrongful conviction lets the guilty go free. This is an important look at a pressing issue in the news with every exoneration.