I am currently in the process of planning a series of novels, and have hit a wall, so to speak. The series will include three novels. One will follow the story of a young orphaned boy named Walter, living with a few other orphan children on a farm, under the rule of a heartless farmer, and eventually finding himself in another world. Another will tell of this boy's adventures in said world. Another still will tell of this boy as a man, returned to our world and living on the same farm he lived on as a child. The problem I have encountered centers around a shift from antagonist to protagonist, or protagonist to antagonist. In the first and second stories mentioned, the reader will side with Walter, in the first sory as he finally kills his "caretaker" in order to avoid his own murder, and in the second story as he struggles to survive in the other world. Upon Walter's return, in the third story mentioned, Walter has changed, and becomes the antagonist. I have several questions. First, is it possible to have a reader love a character for two books and totally hate his or her guts for a third? If so, does it seem easier to shift from love to hate, or from hate to love? And finally, would this process work best if presented in a single novel riddled with changes in time and place, or a separate three-part series? Thanks in advance.