Trapped in a superstore by a series of escalating disasters, including a monster hailstorm and terrifying chemical weapons spill, brothers Dean and Alex learned how to survive and worked together with twelve other kids to build a refuge from the chaos. But then strangers appeared, destroying their fragile peace, and bringing both fresh disaster and a glimmer of hope.

Knowing that the chemical weapons saturating the air outside will turn him into a bloodthirsty rage monster, Dean decides to stay in the safety of the store with Astrid and some of the younger kids. But their sanctuary has already been breached once. . . .

Meanwhile, Alex, determined to find their parents, heads out into the darkness and devastation with Niko and some others in a recently repaired school bus. If they can get to Denver International Airport, they might be evacuated to safety. But the outside world is even worse than they expected. . . .(Cover and synopsis from Goodreads.)

• I had read Monument 14, the first book in this series, about a year before I read Sky on Fire, so I didn’t remember too much about the first book, but as I was reading Sky on Fire I was able to remember a lot.
• I love how there’s a map of the Greenway store in the front of the book, and in the back there’s a map of the path Alex and the others took on the bus from the store to the airport.  Maps always add so much to a book, I think!
• There is still a lot of suspense in this book, both in Dean’s chapters in the store and in Alex’s chapters on the bus on the outside.  And tons of suspense near the end!
• I’m glad that in this book there wasn’t a recurrence of the strangely censored curse words that appeared in Monument 14.
• Some very sad parts; I even got a little choked up at one point and I hardly ever cry at books!
• The end was kind of interesting.  I’m not sure what’s going to happen in the next book from the way Laybourne left this one…