"I Am Number Four" is a science fiction novel by Pittacus Lore that follows a teenage alien named John Smith, who is one of nine survivors from the planet Lorien. He is on the run from a group of enemies known as the Mogadorians, who seek to eliminate him and the other survivors. John possesses special abilities that he is still learning to control as he tries to blend in with humans. As John moves to a new town in Ohio, he forms friendships and develops a romantic relationship with a girl named Sarah Hart. Throughout the story, he grapples with his identity and the responsibilities that come with being one of the last of his kind. The novel explores themes of friendship, love, and the struggle for survival.