The sequel to the book I Am Number Four follows Loric alien Number Seven as she experiments with her newfound powers which will help her defeat the enemies of the Loric, the Mogadorians. Meanwhile, the book also follows Loric Aliens Numbers Four and Six and human Sam as they run across the United States pursued by the Mogadorians. As well, the book deals with how the Loric develop their powers in order to fight a battle against the Mogadorians that will determine the fate of the Earth itself. I enjoyed this book because it had a lot of action-filled moments, and also, it was a great example of science fiction. I also enjoyed the detail that the author put into this book.  I recommend this book to all sci-fi fanatics, people who like action-packed reads, and people who enjoy detail. I also recommend going back and reading I Am Number Four, because it is the beginning of the series and helps familiarize you with the main story and terms used in the sequel.