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, they rode in chauffeured automobiles, built mansions, and sent their children to study in Europe. Then, one by one, the Osage began to be killed off. More and more members of the tribe began to die under mysterious circumstances. In Killers of the Flower Moon, David Grann revisits a shocking series of crimes in which dozens of people were murdered in cold blood. It is a searing indictment of the callousness and prejudice toward American Indians that allowed the murderers to operate with impunity for so long.