This book is full of mystery and codes that you can unscramble your self. In this book there is a big mystery and it will get you thinking about what is going to happen next. It has a moral and the moral speaks about getting over your fears. In the book she goes on a mission under the sea but she is horrified of the deep end. Will she get over her fear and go on the mission. Even though I haven't finished reading but I already recommend it to everyone that enjoys a good under cover spy book.