With the future of House Nuada in peril, and her Otherworld reputation in tatters, Dr. Rosie Parker-Fitzpatrick, aka Lady Mac Nuada, joins her beloved Tax Man on a rookie "spy mission" into the foreboding corners of the Elven Kingdom of Asgard. Untrained in Fae warrior arts, and with only the barest level of tooth fairy magical skill, the courageous and loyal dentist quickly discovers that spy life is far from the glamorous adventure portrayed in the media.

In search of answers to haunting questions, Rosie soon learns the hard way that the arduous land trek to the northern reaches of Elven territory is more physically taxing and dangerous than she could have ever imagined. Hostility and danger greet the Lord and Lady at every turn as they ultimately come face to face with the ancient, dark sorcery magic of the Dokkalfar people, a hidden mage's grimoire, and a single turning point that will change both of their lives forever.