On her sixteenth birthday, Y/N chooses Dauntless despite her unclear aptitude test and the warning that choosing wrong could mean exile. Dauntless initiation is brutal, and her trainer, Four, pushes her harder than anyone else. As Y/N’s unusual abilities begin to surface, Four realizes she’s hiding a dangerous secret the government wants erased. Their connection deepens as they fight to keep her identity hidden, survive initiation, and uncover the truth behind why people like her are hunted.