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This book is kind of a let down in the series. For the first 3 books the main character is Tally Youngblood. Extras is the 4th book in the series. All of a sudden there is a new main character, Aya Fuse. Other than this little downgrade, the book is excellent. It has an amazing storyline that will keep you on your feet still has some of the old characters like Tally and Shay which is good too.