Dillon’s one man war with Summerfield has spark a planetary disaster that threatens to wipe out all life on Earth. Rell and the others struggle to find a new normal amongst the Grimham citizens after an attack forces them into a nomadic existence. Rell’s group works to master their newly awakened abilities, allowing them to better repel the relentless hordes of monsters that threaten to devour them.

Sonia is pushed to the limit with the loss of a child and the tightening restrictions of Summerfield. Can she find a way to protect her surviving child? Will she be able to earn the trust of the frigid leader of Summerfield or can she find her own way to freedom? Old faces and new allies all converge on the final Summerfield stronghold. Will the embers of humanity find a way to survive the extinction event looming on the horizon before they fall prey to the endless sea of deadly mutant monsters?