John, or Four, is not from Earth. He is one of nine Legacies escaped from Lorien before it was decimated. In those nine sets the fate of the universe.
But the first three are dead and the Legacies must be killed in order. John and Henri, his guardian, head to Ohio to hide, again. It's worse this time, since John knows he's next.
He still tries for a normal life. Sarah, a girl who catches his eye from the beginning, is also interested in him, and Sam, a nerd fascinated by space and aliens, are his two only friends. John tries to avoid drawing attention, but it only works to a point. Meanwhile, his powers are developing; he is able to control light and fire, move things with his mind, and that's just the surface.
Then Sarah gets trapped in a burning building and all hell breaks loose. John's cover is blown and the Mogadorians are coming.
While the action keeps up, even with John's training and everything at school, nothing really happens until late in the book. The story has a lot of good elements, but the ending felt like the movie Thor: "I'll come back for you". A good book and it should be popular. Who doesn't like a superhero.