Luce Price is living an ordinary teenager's life until she is accused of being involved in a young boy's death. She is sent to the strict Sword & Cross reform school, where she finds herself being pursued by two enigmatic students to whom she feels a powerful connection. Alone, and troubled by disturbing visions, the mysteries of Luce's past become known to her, and she comes to realize that the two men who are pursuing her are actually fallen angels who have been rivals for her love for centuries. Now Luce must choose, setting Heaven against Hell in the process.