Passport was a unique read. Sophia's feeling of disconnection from her peers is an almost universal experience for teens, but far exacerbated by her nomadic childhood and the secrets she lived with. This is the first book I've read where a kid guessing that their secretive parents work in espionage have been right. Overall, I enjoyed that the author didn't tie up every loose end or make a happy ending. She left it as it was, with hope for what was to come.