Author John Green has a new novel coming out this fall on October 10 through Dutton Books. The book is called "Turtles All the Way Down" and tells the story of a 16-year girl in search of a missing billionaire as she copes with mental illness. According to Dutton, the new release of the book is about lifelong friendship, the intimacy of an unexpected reunion, Star Wars fan fiction, and tuatara. This is Green's first book since "Fault in Our Stars," which came out in 2012.