Nothing yet, eh? I'll kick things off by nominating Lolita.
The description cribbed from Amazon:
Awe and exhiliration--along with heartbreak and mordant wit--abound in Lolita, Nabokov's most famous and controversial novel, which tells the story of the aging Humbert Humbert's obsessive, devouring, and doomed passion for the nymphet Dolores Haze. Lolita is also the story of a hypercivilized European colliding with the cheerful barbarism of postwar America. Most of all, it is a meditation on love--love as outrage and hallucination, madness and transformation.
The ebook is available at the usual venues and Overdrive as well.