When the Valley falls to Sunblade and Carla's mother is captured, Carla realizes that only her father is powerful enough to defeat Sunblade and save her mother. But Athol is a prisoner of the High Court in the Realm Under the Hill. After the assassination of the Aos Si king, Shade has escaped but is hurt and dying. He flees into the hands of an unexpected benefactor who leads him back to Carla. Shade and Carla fight their way into the forbidden Realm Under the Hill to free her father, despite the warning that if they go Under Hill, they can never return.

When Carla's mother drags her from their home in Denver to the-middle-of-nowhere Colorado, Carla figures her life is over. But a mysterious neighbor embroils her in a battle between the ancient and powerful Aos Si. Then she meets Shade, a servant of the evil Aos Si. Carla's attraction to Shade is as deep as the power flows that surround them, but her attempt to free him from evil sinks them both in deeper and escalates the war. Grab your flashlight and dive under the covers, because Aos Si will keep you turning pages well past your bedtime. (Christina F York author of Girls Gone Magic)

With Carla's mother trapped in the dark underbelly of the Denver airport, Shade heads to Loch Ness to visit the Midnight Court and gather a Shadow Si strike force, but the Shadow Si are not what he expects. He mistakes a foe for a friend and loses the most precious piece of his soul, a piece that could destroy his love for Carla. When Shade leaves to go to the Midnight Court, Carla fears he will settle into the shadows and never return to her. She travels with her father to rally an Aos Si army to fight Sunblade, but when she realizes that even her father's closest kin won't stand with him and fight, she heads to Denver to face her enemies and free her mother on her own. This inspiring conclusion of the Aos Si trilogy will leave you breathless, make you laugh, and warm your heart.