So this was a well-written book and I love the plot but the two main girls are ridiculous and not in a good way. I read this book in half a day but almost stopped a few times because the characters were just so frustrating. 
 Henri is entitled, self-centred, vengeful and petty AF throughout the whole book. I didn't see any growth from her and the end where she "bared all" didn't even come close to justifying how she abused her sister throughout the whole book. 
 Emma...its like she perpetually has Stockholm syndrome. Sister of not, there's no reason to allow Henri to treat you like that! She continuously makes excuses for her sister to act like a monstrous human being. 
 IT SHOULDNT TAKE YOU BEING STRANDED ON A DAMN ISLAND TO START SHOWING HALF AN OUNCE OF CHARACTER GROWTH OR GROWING UP PERIOD. 
 I'm not crazy about the wrap-up. I don't think Henri really learned to grow up....in fact, she ends up getting to backpack around Europe paid for by her parents! Really unhealthy and (at least to me) an abusive sibling relationship.