Nine teens are sent from their home planet, Lorien, to escape the Mogadarians, a vicious species bent on destroying them. Determined to keep their species alive, the Nine have arrived on Earth, where they scatter, living in secret among human beings and protected by a charm: they can only be killed in numerical order. As the novel opens, the Mogadarians have found the Loriens on Earth, and Number Three has just been murdered. John Smith is Number Four, and though he appears to be an ordinary teenager, he is gifted with a "Legacy," the potential for unimaginable powers. Now he must awaken those powers to escape the Mogadarians and band with the remaining five Loriens if he hopes to defeat his enemies once and for all. Filled with action, suspense, and winning characters, this catch-me-if-you-can science fiction novel will have readers racing to the end.