Nonfiction storytelling at its best. Grann draws on extensive research to tell a gripping account of the Osage Indian murders. In 1920s Oklahoma, the frontier was closed, but the Indian killing continued as corrupt men sought to separate the Osage from their newfound oil wealth. During a four-year reign of terror mostly forgotten to history, scores (or by some accounts, hundreds) of Osage died under mysterious and often violent circumstances. The investigation of these deaths built momentum for the organization that became the modern FBI.