When she finds a manuscript in her late grandfather's bookshop, Olivia Kavanaugh becomes fascinated by the story of two girls who mystified the nation with their authenticated photographs of fairies and soon realizes that their lives intertwine with hers.
Niviene, the daughter of the Lady of the Lake, recounts her life as a member of the Fey, sister of the knight who would be known as Lancelot, and student of Merlin as she discovers her destiny at the court of King Arthur.