The Fault in Our Stars is the sixth novel by author John Green, published in January 2012. The title is inspired by Act 1, Scene 2 of Shakespeare's play Julius Caesar, in which the nobleman Cassius says to Brutus: "The fault, dear Brutus, is not in our stars, / But in ourselves, that we are underlings." The story is narrated by Hazel Grace Lancaster, a 16-year-old girl with cancer.