Back of Beyond

Cody Hoyt is a cop–a homicide detective and a good one. Like quite a few cops (at least the fictional ones) he has a drinking problem, but is trying to keep it under control. His life spins out of control, however, when his good friend and AA sponsor is found dead in his cabin. At first it looks like an alcohol related accident, but Cody is convinced that it wasn't. Soon his hunch is backed up by some forensic results, and Cody is on the case like a dog on a bone, determined to find his friend's killer.
This is a C.J. Box story so naturally things don't stay in a town or city. Clues lead Cody to suspect that there is a connection to a group on a horseback trip into a wilderness area, and action soon shifts to Yellowstone national park. Along the way things get very dark and very dangerous. Things and people aren't what they seem and somebody seems to be anticipating Cody's moves. There are some twists and surprises and a good exciting finish. We have stampeding horses, dangerous wildlife, and even more dangerous people. By the end of the book the body count is pretty high.
Good book with some interesting characters. I am getting quite fond of C.J. Box.