Ashen Winter (Book #2 in the Ashfall Trilogy)

by Mike Mullin
Lexile:  730
Genre:  Science Fiction

Alex and Darla are trying to make sense of the world in which they now find themselves living. The volcanic eruption at Yellowstone National Park has changed the midwest into a dark and cold battlefield.  They seem to be in the midst of an eternal winter and people are willing to do anything to survive.  Alex and Darla promise that they will stay together no matter what.