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. The family of an Osage woman, Mollie Burkhart, became a prime target. Her relatives were shot and poisoned. And it was just the beginning, as more...

The Reign of Terror against the Osage people was one of history's most ruthless and shocking crimes. As the Wild West was dying, someone was killing members of the Osage nation who had gotten rich off the oil under their land. Investigators who tried to uncover the truth were disappearing, but still J. Edgar Hoover asked a former Texas Ranger to work with the Osage to unravel the mystery.