The COLd DiSH: Craig Johnson

The first book in the Walt Longmire series. Walt is characterized as a widower, who is a bit of a slob and the sheriff of a small town in Wyoming. His best friend, Henry, is from the reservation and helps him with his cases when he is not running his bar. Suddenly boys convicted in a rape case against a young, challenged girl from the reservation, turn up dead. At first Walt thinks the murderer is a native, because there are symbolic "Eagle" feathers on the bodies, but the feathers turn out to be fake. Walt goes on a few dates while he is not on the case and then learns more about the woman he is seeing than he wants to. As a child she was raped by her father, who ended up killing himself, and she wanted justice done against the four boys.