As if losing her mother and moving to live with her grandmother in Knob's End weren't enough to contend with, sixteen-year-old Sophie James soon discovers that her new best friend is more than the average high school girl. Nerys is a magical Tylwyth Teg from the land of Annwn, and has been forced to seek refuge from a terrible fate.Unless the people of Annwn can find a way to break the pact made with the sinister Coraniaids some two thousand years...