Villette for the story, and the psychology of autism / trauma
I wish I had a first edition copy.
Wuthering Heights for narrative structure and critical analysis
The Picture of Dorian Gray for philosophy.
Runners Up:
Hester, Margaret Oliphant for character
The Portrait of a Lady, Henry James for "I love this book", and character
Same q
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And in the end, the love you take is equal to the love you make.