I had a lot of problems with this book: 
 1.) This is set 3 years after If I Stay and for me that didn't seem like enough time. In fact, Gayle seemed to write Adam and Mia so much older to me, they were only 21! No offense but no one is this deep or wise at 21, I've been there, I know lol. I think If this had been pushed to their mid twenties it would have made a bit more sense - more time for the two of them to be screw ups and realize they need each other. 
 2.) Adam went from charming and smart in IIS to a total lame-o in this book. Okay okay it was a "tragedy" that your girlfriend never officially broke up with you and stopped calling you. EXCEPT NOT! You wrote a hit record, made a ton of money, and are totally famous - cry me a river Adam! Okay maybe that's a bit harsh, but he was basically whining this entire book and I just couldn't handle it. I don't completely blame him for feeling hurt but geez to carry it around like a badge for 3 years? Come on man, get over it. 
 4.) Mia's reasoning for not properly breaking up with Adam made zero sense to me. I guess you can chalk my reaction up to a decade older perspective but still couldn't she have just wrote him an email like she was already doing? 
 5.) The only part I really thought was well done in this book was the last few chapters when they got to talking about what really happened with them and the connection the book made to IIS. Prior to that, their jaunt around NYC was forced and silly - why on earth did Adam not begin their interaction with "Hey instead of giving me a tour of NYC that I don't need, why don't you fill me in on why the hell you stopped talking to me three years ago?" It's like Mia didn't think this needed to be brought up! 
 6.) The conclusion, although completely inevitable, was a little too perfect for me. Oh well fine I guess why read these books if they don't end happy. 
 Overall a sort of expected YA series that doesn't really deserve the hype but will probably be enjoyed by those who like like YA romance.