Review: Ashfall by Mike Mullin

From Goodreads: Ashfall is the story of Alex, a teenage boy left alone for the weekend while his parents visit relatives. When the Yellowstone supervolcano erupts unexpectedly, Alex is determined to reach his parents. He must travel over a hundred miles in a landscape transformed by a foot of ash and the destruction of every modern convenience that he has ever known, and through a new world in which disaster has brought out both the best and worst in people desperate for food, water, and...