In the 1920s, some of the wealthiest people in the world belonged to the Osage Indian Nation of Oklahoma, who had benefited greatly from the discovery of oil on their land. When the Osage began to die under suspicious circumstances, something was clearly amiss. After the fledgling F.B.I. took over the case, they discovered extensive prejudice, corruption, and deliberate obstructions of justice, all of which allowed the perpetrators to operate freely for far too long. Their work eventually uncovered one of the most horrific and tragic conspiracies in the history of our country. Grann’s gripping account of these largely unknown events will fascinate and shock readers from beginning to end.