Okay, so it seems particularly hard to review book 2 in a series without giving any spoilers from book 1, but I'm going to do my absolute best to accomplish this here... even if it means I'm not really telling you anything, for real. LOL! 
 Anyways, IT'S NOT SUMMER WITHOUT YOU picks up where THE SUMMER I TURNED PRETTY left off. Something (tragic) has happened, and Belly, Conrad, and Jeremiah are left to deal with it. Nobody's at the beach house right now, and Conrad has disappeared. Since he has no clue what's happened to his brother, Jeremiah calls Belly for help, and they go seek out Conrad and try to figure out what's going on. Then everyone attempts to deal with the aforementioned tragic event. And, Belly pretty much has no clue what she wants. AGAIN. 
 That's pretty much all I can tell you without spoiling anything. Whereas BOOK1 alternated between the past and present, BOOK2 alternates between the voices of Belly and Jeremiah. Why these two, I wonder? I think I'd rather hear from Conrad, or at least alternate between Jer and Conrad a bit. I think after two books we still don't know anything about Conrad... but maybe that's the point. 
 And, I GET that Belly is young, and as such she's incredibly indecisive, but the way she just flits around.... so wishy-washy ... is becoming less and less endearing. 
 Even so, I did enjoy this book, if for no other reason than because it sets up BOOK3, where MAYBE Belly will do something different! I have faith in her! BOOK3 is where it happens!