When a marauder destroys the underground sanctuary that Eva Nine was raised in by the robot Muthr, the twelve-year-old girl is forced to flee aboveground. Eva Nine is searching for anyone else like her: She knows that other humans exist because of an item she treasures--a scrap of cardboard on which is depicted a young girl, an adult, and a robot, with the strange word, "WondLa." Can she find where she belongs?