I’ve seen many a book or film in which a deranged villain spends most of one of the final scenes explaining his master plan to the hero (or heroine) and then proceeds to try and persuade them to join up with him, the “Turn to the dark side Luke” syndrome. In all the examples I’ve seen or read the villain’s scheme is sufficiently dastardly or insane that our protagonist turns them down and proceeds to step B (the thwart).
Does anyone know of piece of fiction in which the bad guy actually succeeds in talking the good guy round to his way of thinking? The only near example I can think of is a certain famous comic book series (which I have no desire to spoil if you haven’t read) but that doesn’t really count because the villain has already succeeded by the time the exposition takes place. I’m also interested in any examples of this type of thing where you thought the villain actually made a good logical case for their actions.