Valancy lives a drab life with her overbearing mother and prying aunt. Then a shocking diagnosis from Dr. Trent prompts her to make a fresh start. For the first time, she does and says exactly what she feels. As she expands her limited horizons, Valancy undergoes a transformation, discovering a new world of love and happiness. One of Lucy Maud Montgomery's only novels intended for an adult audience, The Blue Castle is filled with humour and romance.

Lucy Maud Montgomery OBE, published as L. M. Montgomery, was a Canadian author best known for a collection of novels, essays, short stories, and poetry beginning in 1908 with Anne of Green Gables. She published 20 novels as well as 530 short stories, 500 poems, and 30 essays. Anne of Green Gables was an immediate success; the title character, orphan Anne Shirley, made Montgomery famous in her lifetime and gave her an international following. Most of the novels were set in Prince Edward Island, and those locations within Canada's smallest province became a literary landmark and popular tourist site.

Montgomery's work, diaries, and letters have been read and studied by scholars and readers worldwide. The L. M. Montgomery Institute, University of Prince Edward Island, is responsible for the scholarly inquiry into the life, works, culture, and influence of L. M. Montgomery.