Day 04 - Favorite book of your favorite series

Since I said that the Fifty Shades of Grey series was probably the only series I've read, besides the Harry Potter series, I'll say that in the Harry Potter series I love Harry Potter and the Goblet of Fire and in the Fifty Shades series, book 2, Fifty Shades Darker, is my favorite, because you learn a lot more about the mysterious billionaire playboy Christian Grey. Not only that, you feel sorry for him because he worries that his now wife, Ana Steele, will leave him at any time.