I've often thought about writing stories featuring a main character is more or less a very evil man. The idea is that as the story progresses the readers learn more about the main character through flash backs. To make things clear the main character is pretty evil in the first book he kidnaps his love interest and she develops a Stockholm syndrome like relationship with him. It's in the sequel that he becomes slightly better but still pretty bad. However throughout the story he starts to evolve as the person.