In the 1920s, the richest people per capita in the world were members of the Osage Indian Nation in Oklahoma. After oil was discovered beneath their land, the Osage rode in chauffeured automobiles, built mansions, and sent their children to study in Europe. Then, one by one, they began to be killed off. One Osage woman, Mollie Burkhart, watched as her family was murdered. David Grann revisits a shocking series of crimes in which dozens of people were murdered in cold blood. The book is a masterpiece of narrative nonfiction, as each step in the investigation reveals a series of sinister secrets and reversals. But more than that, it is a searing indictment of the callousness and prejudice toward Native Americans that allowed the murderers to operate with impunity for so long.