Vengeful Hearts — Susanne L. Lambdin

Exiled from Highbrow's camp, Cadence and her Earth Corps take control of NORAD and prepare to fight back against the Kaiser and his elite Shadowguard. First, they must overcome the zombie horde that has infested the facility since the Scourge. Darkness looms heavy as both camps face isolation, internal strife, and a shadow of evil that haunts their every move. There is no rest for the wicked as the Kaiser seeks the eradication of anyone who stands against his march toward global dominion. Ancient monoliths, time travel, and a newly awakened race of demons present unprecedented obstacles as the disparate forces join together to hold back a tide of evil that threatens to consume the remaining thread of humanity. Join your favorite characters as they continue their fight for survival, and the survival of the human race, in the story that has been called, ..".a new twist on the supernatural scene."