It's hard for me to choose a least favorite book, but I would have to say Scarlet, just because I've never really felt a connection to her character like I have with the others. In my opinion, the romance goes too fast. Like, they've known each other for 2 days and they're already at I love you's and kissing. I just didn't find her story as interesting as the other books in the series. Again, I'm not saying I hate it, but it's just not my favorite in the series.