I AM NUMBER FOUR starts in a small Florida town while John and Henry live peacefully. When John was just a little boy, his home planet, Lorien, was attacked and destroyed by the Mogadorians. When Lorien was almost completely destroyed, the last of the Lorien people chose nine to save. John is number four. The nine children are all sent to live on Earth and hide. The Mogadorians set out to kill the last of the Lorien in order. When number three is killed John knows he is next. When John has his first legacy in Florida, he and Henry decide to move to Paradise, Ohio, a quiet peaceful town. While living in Ohio John makes one of his only friends, Sam Goode. Just when John and Henry think that they are safe and sound, trouble starts up again. John and Sam fight in many battles just for their lives. After so many fights, John finds one of his own, Number Six. John, Sam, and Six find the Mogadorians and defeat them in their local school. John realizes that he still has many more Mogadorians to defeat, but before that, John and Six set out to find the rest of the Loriens before it is to late.