"Among the Betrayed" is a young adult novel by American author Margaret Peterson Haddix, first published in 2002. The novel is set in a dystopian society where third children are illegal, and the government is ruthless in its pursuit of them. The story follows the protagonist, Nina Idi, a third child who has been captured and imprisoned along with a group of other third children. Nina is offered a chance at freedom if she agrees to become a spy and betray her fellow third children. As Nina struggles with her conscience and the fear of being caught, she begins to uncover secrets about the government and its treatment of third children. The novel explores themes of loyalty, betrayal, and the struggle for freedom in a repressive society. It is part of the "Shadow Children" series by Haddix.