"Fallen" is a young adult fantasy novel written by Lauren Kate. It follows the story of Luce Price, a teenage girl who is sent to a reform school after being accused of a mysterious incident. At the school, she encounters Daniel Grigori, a mysterious boy with whom she feels an instant connection, leading her to uncover secrets about her past and their intertwined fates. The novel explores themes of love, destiny, and the battle between good and evil. As Luce navigates her feelings for Daniel and the enigmatic Cam, she learns about the existence of fallen angels and the consequences of their choices throughout history.