Alex is home alone for the weekend when the Yellowstone supervolcano erupts. His house is hit with flaming debris; escaping is only he beginning of his problems. While he had been looking forward to a weekend without his parents or sister, all that matters now is traversing the 160 miles to his uncle's house to reunite with them. But 160 miles of sludgy ash isn't easy to cross, even with skis: there are still looters and criminals about, and distinguishing them from kind strangers is tricky at best. 
 I've been putting this one off because it's long, but once I actually got into it I spent the whole day turning pages. 
 I already knew that the Yellowstone volcano existed. Now I live in fear of it.