Fourteen-year-old Angel has just escaped from an evil wizard after being tricked into training to be a servant of evil by a Black Heart spell. She and her Spirit Council friends have traveled to Sedona, Arizona to find and destroy the evil book that gives power to the dangerous wizards in the area. No one knows, though, that Angel's air affinity powers are gone. She's determined to keep it that way as she tried to remove the dark energy infecting her.
A Native American spirit advises Angel that she must create a Fire Moon to regain her powers. A visit to Limbo, the "in between" world of dreams and imagination, gives her and her friend, Nina, the chance to make one in a dangerous ceremony that will either return Angel's powers or destroy them both.
Not only is their new mission important to protect life on Earth, but it will also free Kardun, the last of a mythical race of horses who is bonded with Angel. In a final dangerous mission, Angel and her Spirit Council must harness the power of the Fire Moon and figure out how to work together as a team or the visions that she's had of her friends dying will come true.