Book three of the best-selling prepper fiction series, Old Preppers Die Hard.
Only the insane have strength enough to survive. Only the survivors determine what is sane. Farley's insanity is not always the logic of an accurate mind over-tasked, but something else, something deeper. He ponders the complexities of looting and scavenging food and shelter in order to survive. Looters get shot for stealing; so do survivalists.
"Though this be madness, yet there is method in it." (William Shakespeare)