Living with her overbearing mother and meddlesome aunt, she finds her only consolation in the forbidden books of John Foster and her daydreams of the Blue Castle—a place where all her dreams come true and she can be who she truly wants to be.

Shortly after her birthday, Valancy receives some news about her health that makes her decide to throw caution to the wind and make a fresh start. Rebelling against her family, she soon discovers a surprising new world, full of love and adventures far beyond her most secret dreams.