"Killers of the Flower Moon" is a nonfiction book by David Grann that details a grim chapter in American history known as the Osage Reign of Terror during the early 1920s. The story revolves around the Osage Nation in Oklahoma, whose members became extremely wealthy after oil was discovered on their land. This sudden wealth attracted white opportunists who orchestrated a series of murders targeting the Osage people to inherit their oil rights and fortunes. The book focuses especially on the tragic experiences of the Burkhart family, whose members were systematically killed, involving betrayal within the family and a corrupt local political figure orchestrating the crimes. The murders prompted the involvement of the newly formed FBI, leading to investigations, arrests, and trials that revealed the depth of corruption and violence against the Osage. The narrative also highlights cultural conflict, exploitation, and a fight for justice for the Osage people during this dark period. The story has also been adapted into a 2023 film directed by Martin Scorsese, starring Leonardo DiCaprio and Robert De Niro, which dramatizes the events of these murders and the broader historical context of the Osage Nation's plight.