I have to admit to being a little confused by this book. Grant is not the man we thought he was. 
 Grant always struck me as the compassionate rational sibling and then he got involved with Nan which actually did make sense because for some reason Grant started to believe that Nan just needed someone. In reality she has a fatal cause of bitchiness. 
 The thing is when it comes to Grant's story he seems more destructive and out of control than the Grant who put gas in Blair's truck or was always there to pull people back from the brink. 
 In part, this has to do with the blow dealt to the group but in reality I think it is just a poor turn in the story to make more drama in the book than was actually necessary. 
 Harlow's life and dealing with Nan are drama enough. After all Harlow is the daughter of a rockstar and her life is going to be turned upside down with a life altering revelation and then there is her secret. 
 I believe these things were enough to carry the story and even provide the tension that comes at the end of this book and the break in Harlow and Grant's relationship (much like Rush & Blair and Woods & Della). 
 The story is enough to intrigue you and keep you interested but I can't say the story or the series is spectacular reading.