I cannot be impartial with this book. Caleb and Maggie are two of my favourite characters in books and I was so happy I could read the rest of their story that I didn't really care about how it was written. 
 But I sure realize one thing: it's present tense and it's first-person narrative and it's very well done, because you don't notice it the whole time (like in the book I read before that one). The rhythm is fluent, doesn't get stuck in details you don't need. It's sometimes repetitive, but without being annoying. The whole story is very strong in feelings, you feel like the characters. That was nice *___* The plot, the premise for the book is perhaps a bit weak, I think plots for second parts is Elkeles' weak spot and the secondary characters, as well, even if she did a good job with Lenny, the rest were a little bit blurred. 
 I read somewhere that Caleb was mean in this book. Hmm! I didn't see him that way. I saw him tormented, trapped in the past. That made him sour and tough. That and the life he chose to live at the end of "Leaving paradise". But it was beautiful to see him recovering thank to Maggie and it was nice to see that Maggie grew stronger and more secure. And it was pretty to see them together again *____* 
 All the story lines are closed at the end of the book, but one. When Maggie returns from Spain, she tells the reader about everybody, but Leah, or did I miss that? fO.o 
 You liked/loved "Perfect Chemistry"? You need to read "Leaving paradise" and "Return to paradise".