After a horrific mutilation renders former Chicago police detective Matt Callahan a recluse, he is given a second chance at life as sheriff of tiny Nicolet County in the Northwoods of Michigan. Idyllic, peaceful, and sparsely populated, the island community hides a web of secrets Callahan and his young female deputy must uncover before a great city an ocean away explodes in violence and is thrown back into a half century of carnage. Irish paramilitaries, the British Royal Family, a century-old Irish enclave in Michigan's Upper Peninsula, the long reach of modern terrorism, and the incendiary effect of a single spark on the lasting peace of a nation combine to make a volatile brew in this engrossing Midwest mystery.