CJ Box. I've come to really enjoy his books, not a one I've not enjoyed. Stories based around Wyoming and the trials and tribulations being a Game Warden. I am finishing up Free Fire right now and it's really good. It's about a crime in Yellowstone. All the descriptions are right on concerning the park and even West Yellowstone.
Here is a link, related to the background of your book: The Perfect Crime May Be Possible in Yellowstone Park. I hope it is not a spoiler, for you.
Sounds pretty good...I've gotten away from books about murder and crime but they used to be a favorite genre for me. I haven't read any good biographies lately so may go back to what I used to like....thanks.