Killers of the Flower Moon, The Osage Murders and the Birth of the FBI by David Grann
This is a look at an important part of our history that most of us have never heard of. As we all know, Indians were forced off their lands, and many of them were shoved into Oklahoma, whether they wanted to be there or not. One group, the Osage, discovered oil on their lands and become very wealthy as a result. Predators swooped in and did everything they could to grab the wealth out of the hands of the Osage, including many, many murders with coerced or forged wills that left the oil rights to the murderers.
It's a fascinating look at this saga, and includes the "birth of the FBI." J. Edgar Hoover was new in his role as Bureau Chief; he pushed his investigators to solve the murders and help grow his department.
The book is very well-researched by the author of another fascinating book, The City of Z.