Under a Flaming Sky by Daniel James Brown (2006)

Subtitled The Great Hinckley Firestorm of 1894, this is a wonderfully written, researched and documented and deeply personal book on the Hinckley fires. Unbelievably absorbing and amazingly vividly told, it's one of the best non-fiction books I've ever read. I even wrote a fan letter to the author.  He also wrote The Indifferent Stars Above, which explores the Donner Party tragedy in full, glorious, horrifying detail.