Killers of the Flower Moon: The Osage Murders and the Birth of the FBI by David Grann tells the story of the series of murders of the Osage tribe members, which came to be known as the “Osage Reign of Terror”. Just like numerous Native American tribes, the Osage had been pushed to a presumably worthless area of land in northeastern Oklahoma by the white settlers. Their territory, however, turned out to be one of the United States’ largest oil deposits. The Osage owned headrights to the oil, hence prospectors were required to pay them for leases and royalties. Over a period of many years, the white Americans masterminded the killings of many members of the Osage tribes, and devised an elaborate cover-up to gain control of their headrights, which would entitle them to a share of the oil leases.