Presents a true account of the early twentieth-century murders of dozens of wealthy Osage and law-enforcement officials, citing the contributions and missteps of a fledgling FBI that eventually uncovered one of the most chilling conspiracies in American history. "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,...