Marie Belloc Lowndes 
Jane Oglander [EPUB ebook] 

Another hard to find great old book, with a much younger gorgeous wife married to an aristocratic, rich older man that started out adoring her and ended up a frail invalid from suffering a stroke after catching her in an indiscretion with a younger man, that’s where the tale really starts, and what happens following that makes for a fascinating story right to the end. (Amazon)