"I Am Number Four," authored by Pittacus Lore, follows the journey of John Smith, a teenager with extraordinary powers, who is one of nine aliens from the planet Lorien. As he tries to blend in with humans, he discovers that he is being hunted by malevolent beings known as the Mogadorians. Each of the nine aliens can only be killed in numerical order, and John is Number Four, making him a target for these ruthless pursuers. His struggle for survival is central to the plot, as he flees from town to town in a desperate attempt to evade capture.