The Mexican border state of Chihuahua and its city Juarez have become notorious the world over as hotbeds of violence. Drug cartel battles and official corruption result in more murders annually in Chihuahua than in wartorn Afghanistan. Thanks to a culture of impunity, 97 percent of the killings in Juarez go unsolved. Despite a climate of fear, a small group of human rights activists, exemplified by the Chihuahua lawyer and organizer Lucha Castro, works to identify the killers and their...