Hellfire (The Bugging Out Series) (Volume 7)

Book 7 in The Bugging Out Series

Seven billion people dead. Only a handful of humanity remains. Sides have been chosen. The final battle is at hand.
 He's done all that's been asked of him. And more. Now, with the survivor colony in Bandon threatened by a nearby volcanic eruption, Eric "Fletch" Fletcher again must put his life on the line to lead a rescue mission into the hellfire of Mother Nature's fury.

That, it turns out, is only the beginning of his journey.

From the rarefied air of Air Force One, across the war-torn streets of middle America, to the front lines of a desperate battle to save all that they've built, Fletch knows that sacrifices will have to be made.
 
How close that reality hits to home, though, is something he could not have prepared himself to face.