Gaia

Humankind is on the precipice of the apocalypse. As the Demons grow bolder and the walls between the planes of existence weaken, Ember is forced to develop her powers as quickly as possible, and she seeks out a powerful earth Watcher to continue her supernatural lessons. Her glimpse of the future demands she fight the dark forces spreading across the earth. But her new mentor has his own agenda, making her question everyone and everything she ever trusted. - Amazon.com.