EMP Don't Mess With a Yeti

A teenager must escape captivity and, using his wits, destroy the most powerful man in the post-EMP world or the rest of his family and many others will die. The problem is that his adversary is the smartest man the teenager has ever met and has an army at his disposal.
The story takes place almost a year after an EMP event shut down the power grid in the U.S. Food supplies are scarce, medical supplies nonexistent, and almost 90% of the population is dead, leaving a drastically changed and lawless land.
This is the fourth book in Mike Whitworth’s EMP series. The previous books are:
EMP:1500 Miles From Home
EMP: Caravan
EMP: 12-Years-Old and Alone