The Dinosaur Hunter by Homer Hickam took me through some interesting twists and turns. I wasn't ever quite sure who were the "good guys" (other than Mike Wire, the main character) and who were on the other side until the very end.
Mike, an ex-cop/retired P.I., works as a cowboy on a ranch in Montana. One gets the impression that, if it isn't the end of the world, you can see it from there. Part of the ranch is leased from the Bureau of Land Management, and thereby hangs the tale.
Norman "Pick" Pickford asks permission to hunt for dinosaur bones on the ranch. He claims he never sells bones, he only hunts them for scientific research. (Do I hear a "Yeah, right!?") Town politics, a cranky BLM agent, Russian mobsters, and a Hollywood director all get involved, making for a strange summary, but a very entertaining book. One of them gets killed - and it's not because of the bones.