From the author's website
Dara is a simple serving girl, a disgrace to a family boasting a long line of powerful mages. In love with Lord Cavin IV, Heir to the throne of Caistran, who would never be allowed to marry a serving maid, Dara journeys to the dreaded Crystal Keep to consult the Oracle there. But braving the hostile Guardian and the dangers of the Keep itself, Dara learns that magic is sometimes found in the last place you look...
Original title: Guardian's Key
Genre: Fiction→ Fantasy→ Romantic Fantasy