Its ashift to focus on Jazz because im used to the caracter of her sister and need to get to know who Jazz actually is...and not who her sister thought she was. 

Lucky we do get a lot of familiar  caracters that get a bigger role. I do very much get the idea yhis book is compleatly writen to set up the relationships between the caracters to highten the drama and stakes for the next book therefore i am looking forward for the next book to drop.