Turtles All the Way Down is a young adult drama novel written by American author John Green published on October 10, 2017 by Dutton Books. It is Green's fifth solo novel, his seventh overall and his first published work since his 2012 novel The Fault in Our Stars. The novel debuted at number 1 on the The New York Times Best Seller list in the category of "Young Adult Hardcover Books" and stayed at the top for 15 weeks and remained on the list for 62 weeks.