I'm giving this book a 5!!! 
 I am a big fan of Perfect Chemistry and i'd always say that its the perfect book among the 3. Reading the last book in the trilogy is just... nostalgic. The story line may not be as good as the first book, but it sure made my day! And it contained details about the two older brothers.. its like im in heaven ^_^... 
 I love everything about this book except for how Luis acted after finding out *something* near the end and except for their shower scene which turned out not to be a real shower scene. haha. beats me why that is. 
 still .. a five for me! yay!