L. M. Montgomery 
The Blue Castle 

Canadian novelist Lucy Maud Montgomery wrote The Blue Castle in 1926. One of the few novels for adults written by L.M. Montgomery. It is the only novel she ever wrote that takes place fully outside of Prince Edward Island. The book was twice adapted for the theatre; in 1982, a popular Polish musical was created from it.Valancy Stirling, who is 29 years old and single, rebels against the monotonous life her family has forced upon her. Valancy keeps her deadly heart condition a secret from her family after receiving a diagnosis. After years of being apart, Cissy and Valancy share a room and rebuild their relationship.After discovering that Valancy had married Roaring Abel, her family disowned her, but she had no intention of returning. Instead, she makes a marriage proposal to Barney, confessing that she is dying and wants to spend her last days with him. They go on leisurely walks around the island and have excellent chats together.She requests a divorce after leaving him, believing that he tricked her into being married. But she later finds that he is also John Foster, the author of one of her favorite books.