William Kent Krueger is the award-winning author of the popular Cork O'Connor mysteries. In Purgatory Ridge, Krueger crafts a riveting tale which has ex-sheriff O'Connor on the case after a heated town debate turns deadly. The local Anishinaabe Indian tribe is furious to discover that Karl Lindstrom's lumber mill is after a grove of trees sacred to tribal lore. So when the mill gets bombed, killing a man, the tribe is blamed. But O'Connor has a different theory.