FBI special agent Mercy Kilpatrick has been waiting her whole life for disaster to strike. Mercy grew up living off the land and off the grid in rural Eagleś Nest, Oregon. A shocking tragedy tore her family apart and forced her to leave home. Now a predator known as the cave man is targeting the survivalists in her hometown, murdering them in their homes, stealing huge numbers of weapons, and creating federal concerns of a possible domestic terrorism event. The crime scene details are eerily familiar to an unsolved mystery from Mercyś past. Sent by the FBI to assist local law enforcement, Mercy returns to Eagleś Nest to face the family who shunned her. She meets police chief Truman Daly, whose uncle was the cave manś latest victim. He sees the survivalist side of her that she tries to hide. If she lets him get close enough to learn her secret, she might not survive the fallout.