Raised as a lonely farm girl in Oregon, Wren has endured isolation her whole life, while her alcoholic adoptive father hides an 18-year secret from her. During a violent thunderstorm, eerie blue underworld fire bursts from her palms, and an old scar on her wrist blooms into a royal vine-and-moon crest, awakening her Blue Tier life-and-death power. Townsfolk brand her a witch, with only her loyal friend Della standing by her side. Kael, an underworld envoy, tracks her matching royal blood, while
