Purgatory Ridge — William Kent Krueger

Not far from the small town of Aurora (population 3,752) lies an ancient two-hundred-acre expanse of great white pines, sacred to the Anishinaabe and known to them as Minishoomisag (Our Grandfathers).

Wealthy industrialist Karl Lindstrom does not have a reputation as a sensitive environmentalist, and some members of the Anishinaabe tribe are concerned about the proximity of the trees to his lumber mill. So when an explosion at the mill results in the death of a night watchman, it's obvious whom suspicion will fall upon.

Cork O'Connor, in the throes of straightening out his life and repairing his marriage, is asked by his successor as sheriff to help with the investigation. His sense of community obliges him to accept, but Cork has distinctly mixed feelings about the case. For one thing, he is part Anishinaabe himself. For another, his lawyer wife, Jo, represents the tribe.

Meanwhile, in a secluded house that overlooks the lakeside home of the Lindstrom family, a reclusive shipwreck survivor and his sidekick also seem to be harboring some resentment of their own against the industrialist. And it soon becomes clear to Cork that harmony, both at home and in the town, will be on the back burner for some time.