I knew nothing about the "Reign of Terror" before reading this book, so just imagine my jaw dropping almost every page. The twists and turns of the case covering the murder spree of members of the Osage tribe were often unbelievable (aka, this story was made for the big screen...it should be in good hands with Scorsese). Grann's writing is really compelling until the final section, which I felt could have been condensed or just included as an afterword or epilogue. But the meat of the story was really well done. In addition to seeing the rise of the FBI under Hoover's determined (and sometimes maniacal) leadership, readers also learn a ton about the lives and traditions of the Osage. The exploitation of their wealth by the US government was hard to read about, and the events that were born out of the headrights system were horrifying. As mentioned in the final part of the book, no amount of retribution or passing of time can heal these families that were broken apart by the Reign of Terror. I'm glad someone finally got their story out to the masses.