This gets more sexually graphic than I’m used to in crime thrillers.  Box’s Cassie Dewell sseries gets pretty rough, but I think this is a step worse on the scale.  These are “females in jeopardy” books – aka Fem-Jep and they were very popular for awhile. Not so much now maybe – 

Blood Trail~  
by C.J.Box; 2008
Read by Dvid Chandler
Rating: A- / Western crime thriller
(#8 in Jim Pickett series)  

It’s deer hunting season in Colorado and Joe Pickett, the former game warden of the area, is now a special agent reporting directly to the governor. While out in the truck checking out the roads and terrain, Joe and his buddy Nate Romanowsky come across a human body in a hunting camp.

That would be bad enough, it’s certainly grizzly,  but the body has been strung up, gutted and flayed so it looks like it was a trophy elk.   What’s happening here? Is someone hunting the elk hunters.  Okay – well,  who would that and why?