Elizabeth thinks she knows the gloomy Fenlen Forest. But when her treasured unicorn fawn, Sida, goes missing, Elizabeth tracks her into a strange land where the people think Elizabeth is a changeling, a malignant being who too-closely resembles a missing girl. If Elizabeth can find her fawn and uncover the fate of her lost double, can she stop the fear from turning into hate? To solve the deepening mystery, Elizabeth befriends a handsome, skeptical young shepherd whose stories hint at a dark secret lurking at the forest's edge, and tame a herd of wild unicorns with the ability to unlock the...