OK - I'll also go with a famous author and a lesser known work.
Fyodor Dostoyevsky and his novella The Permanent Husband
(aka The Eternal Husband
). You can pick this up at Project Gutenberg where it is bundled with Uncle's Dream
. You can also purchase it standalone for about $5 from Amazon etc..
In print the story is approximately 150 pages give or take so it's not huge like some of his other more famous novels.
From one of the world's greatest prose writers, this is a remarkable psychological novel examining the duality of the human consciousness. Velchaninov, a rich and idle man undergoing a moral crisis, is confronted in St. Petersburg by Trusotsky, the loyal husband of Velchaninov’s former lover. Trusotsky informs Velchaninov that his wife has died, and from here this fascinating novella charts the development of the two men’s lives. Beautifully portraying the confused and changing feelings the two men have for one another, this work moves through guilt, hatred, and love. This is Dostoevsky at his best, engaging with his favored themes of tortured minds and neurosis, and treating them in a captivating and highly revealing way.
...and this from Wikipedia:
The Eternal Husband is one of Dostoyevsky lesser known novels. The subject of a deceived husband is lighter than in his other novels, but some critics say this novel ranks among his best works because of its style and structure. Alfred Bem calls it "one of the most complete works by Dostoyevsky in regards to its composition and development."