John Green fans, mark your calendar. The author of the million-selling The Fault in Our Stars has a new novel coming Oct. 10, Dutton Books announced via Associated Press. The book is called Turtles All the Way Down and tells of a 16-year girl in search of a missing billionaire as she struggles with mental illness. Turtles is Green's first book since Fault in Our Stars, which came out in 2012.

In a statement issued through Dutton, Green said the new novel was both invented and personal in its taking on the theme of mental illness. Green's other books include Paper Towns and Looking for Alaska.

TURTLES ALL THE WAY DOWN = OCTOBER 10  

IF YOU WANT TO SEE HIM IN PERSON

We guess he is going to go on a book tour for his new book, but the dates have not been announced yet. Still, you can see him on December 9, 2017, at PodCon, Washington State Convention Centre, Seattle, WA

PodCon is going to feature podcasters from tons of genres including fiction, news, science, comedy, drama, crime, interview and more.

= DECEMBER 9

IF YOU WANT SIGNED COPIES OF HIS BOOKS

Amazon has some signed copies of his new book available for pre-order. Find more info here: Turtles All The Way Down Signed Copies

If you would like to purchase signed copies of his books, you can do so through The Book Cellar in Chicago, which John describes as "the first great bookstore love of my life". Email words((@))bookcellarinc.com and let them know the titles in which you are interested. There is sometimes a waiting list, but they are the best option.

IF YOU WANT TO FOLLOW HIS EVERY MOVE

You can follow John on Twitter at @JohnGreen or like his Facebook at JohnGreenFans.

He also has a Tumblr, a snapchat at @johngreensnaps, and an Instagram at @JohnGreenWritesBooks.

IF YOU WANT TO JOIN ONE OF HIS FAN CLUBS

Want to chat about John's books? You have various options online:

John Green Book Club Group

John Green Fan Club

If you already go to a Book Club but would love to have a discussion guide to help you talk about his books, find one here. 

John Green Books Discussion Guide

IF YOU DON'T HAVE ALL OF HIS SIX BOOKS

As a super fan, you probably own them all, but in case you don't, you can get them here.