On the cusp of a nation seeing the power grid restored since an EMP sent it into darkness seven months ago, Colby and Alicia are riding out the final days of chaos at his Grandfathers cabin in Upper Klamath Lakes, Oregon. When they discover a boy believed to be dead, the two of them find themselves at the center of a conspiracy of silence that holds answers about the blackout. As the ruthless close in and society continues to collapse, Colby enters a post-apocalyptic battleground where he vows to keep the boy safe as they seek to unravel the mystery of those who want to keep him silent.
Meanwhile, in Humboldt, the newfound peace the Riker family gained through the battle of Eureka is once again disrupted. Now a fight between the Stricklands and the Rikers is inevitable, and not everyone will survive.