Harry Potter and the Order of the Pheonix is my favorite Harry Potter book out of the series. I like the feeling of all of the students banding together to make a difference in the face of what seems to be a bad situation growing only worse. I also enjoyed the more adult nature of the book, the themes seemed darker and the stakes seemed higher. Actions truely had consequences (Harry going against the ministry, the dementors coming to Privet Drive, the entire plot about Harry wanting a say in his own destiny) and it felt like our favorite characters were really growing up. Not to mention that there were a couple of sequences in the book that weren't in the movie that I'm impartial to.