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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 and his seventh overall. The novel debuted at number 1 on 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.