

Alasdair Grey - Lanark.
WE by Yevgeny Zamyatin.
Considered by many to be the inspiration behind novels such as Brave New World (though Huxley denied it, most think he was lying, after reading both I tend to agree) and Orwell's inspiration for Nineteen Eighty-Four.
If you want to go back further, WE is believed to have been derived from Jerome K. Jerome's short essay The New Utopia.
Interpretation of Murder for the Oedipus Complex theory!
I really shouldn't have forgotten this one, a work of genius. It's inspiring, it's a bit crazy, it's just a book you should read and be grateful that it has been written.