Killers of the Flower Moon - David Grann

In the 1920s, the richest people in the world were members of the Osage Nation in Oklahoma, thanks to the oil that was discovered beneath their land.  Then, one by one, the Osage began to die under suspicious circumstances.  Anyone who investigated med the same fate.  As the death toll surpassed twenty-four Osage, the FBI launched one of its first major investigations.  A team, including a Native American agent, was handpicked to unravel the mystery.  Together with the Osage, they began to expose a chilling conspiracy.