The Darkest Day

Rhiannon, an Idaho college professor, believed that securing a promotion at work was her biggest challenge. But when disaster strikes Idaho Falls, a massive explosion sets off a chain of events that causes Rhi's forgotten survival skills to resurface. When a secret militia storms the city to eliminate civilians, Rhiannon must use her skills to lead a group of survivors. But after stumbling across a secret civilization, she finds that her involvement in this war is pivotal to human existence. 
 
As she continues her life, assuming that her future is more important than her past, Rhiannon realizes that her past is the key to humanity’s survival. When she steps into a world that nobody knew existed, she discovers that her ability to survive depends on whether she believes she can do it or not. Struggling to believe that the leader of her former organization, The Observers had this much foresight, she wonders how deep the mystery that Tawnie Simms left behind for her actually is.