The Blue Castle – by L. M. Montgomery

Valancy Stirling is 29, unmarried, and has never been in love. 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. After getting shocking news from the doctor, she rebels against her family and discovers a surprising new world, full of love and adventures far beyond her most secret dreams.