Elements of Kill by Christopher Lane

A mysterious ritual murder at a remote Alaskan oil rig brings an Inupiat Eskimo police detective back to the land of his People to catch a killer, and save his own hide.

Police Detective Ray Attla, an Inupiat Eskimo, is spending a few days with his grandfather on the reservation when he's called into the icy Alaskan wilderness to investigate a death at an isolated oil rig. The killing has all the marks of a ritual murder, and Ray must confront the traditions of his People to catch a killer -- before he too becomes a victim.