The penultimate installment of the New York Times bestselling I Am Number Four series. This is the beginning of the end. Number Five has revealed himself as a traitor, Eight is dead, and Ella has been kidnapped. Now the Garde are broken and divided, and the battle for Earth's survival seems all but lost. But hope comes with the arrival of the unlikeliest of allies: Adam, a Mogadorian who turned his back on his people. With his help, the Garde just may have a fighting chance - but are they repeating past mistakes by putting their trust in him?