Vengeance Burns Hot

The morning after helitack pilot Ed Kline's friendship with a female wildland firefighter turns hot, he receives a text from a phone number he's never seen:
Bad thg 1 wk
I leve I die
Cops evry1 dies
Help L 47033012
Could the L mean his adult son Lewis? You're a hero, Lewis wrote to him before disappearing a year ago, but the country you fought for doesn't exist. Then a "bad thg" happens. A group calling itself the PUMAs-Patriots United Militia of America-assassinates two Washington State senators the same day it perpetrates a deadly armored truck robbery. Unnerved, Ed jeopardizes his new relationship, his career, and his sanity while trying to rescue a son who might be one of the killers, trying to escape them, or both.