A sudden disease kills over 98% of the children throughout the world, leaving the survivors with unusual abilities. As a result, the governments of the world place the survivors in a "rehabilitation camp", where they attempt to cure the children of their disease, distinguishing them into classes based on their abilities. Ruby Daly celebrates her tenth birthday with her family, where her father gives her a key chain. Seeing her parents' concern about the disease, Ruby goes to comfort her parents in the night, touching their hands, and inadvertently erasing all their memories with Ruby. In the morning, her mother locks Ruby in the garage; having no recollection of her, she sends Ruby to an internment camp, where Ruby is determined to be an Orange, the most dangerous class where they have the abilities to control other people's minds and memories. Ruby uses her abilities to convince her supervisor that she is a Green, the least dangerous one with extremely high intelligence..