The story takes place in an underground silo, where a small community of people reside in a world that has been devastated by an unspecified cataclysmic event. The inhabitants of the silo live in a state of isolation, shielded from the dangers of the outside world by a robust structure that has been designed to sustain them for generations. The narrative centers around Juliette, a young woman who becomes embroiled in a power struggle with the silo's ruling authority, known as the "Uppers." As Juliette navigates the complex web of relationships and intrigue within the silo, she begins to uncover secrets about the true nature of their world and the motivations of those in power.