John Green will publish a new novel called “Turtles All the Way Down” after he worked on the 2012 hit book titled “The Fault in Our Stars.”

The fans of the well-known author have been waiting for a new book from the maker of “TFIOS,” which later had a movie adaptation making the book all the more successful. Shailene Woodley and Ansel Elgort played the roles of the couple that both had lung conditions and fell in love.

Details on John Green’s new book

The new book of Green will come out this October per his publisher’s confirmation. The first 1.5 million copies will be out by October 10.

“Turtles All the Way Down” will center on a 16-year-old named Aza Holmes. The teen will try to solve a mystery but details about how the major character will be solving remain unknown.

The mystery that Aza Holmes will work on centers on trying to locate a missing billionaire. The main character also suffers from a mental health issue.

John Green says new book is personal

Green also suffers from a mental health issue since he was a child. He opened up about his anxiety and Obsessive Compulsive Disorder. It is unclear which mental health issue will Aza Holmes have to deal with but Green said of the character’s struggles, “This is my first attempt to write directly about the kind of mental illness that has affected my life since childhood so while the story is fictional, it is also quite personal.” He revealed he had therapies for his mental illness back in August 2015 when it became a topic of Reddit’s “Ask Me Anything” thread.

The author also said he worked on “Turtles All the Way Down” for five years before he decided to have it published because the success of "The Fault In Our Stars" was different from his other books. He noted in the past that he has been feeling pressure to come up with a new novel after the global buzz on “The Fault In Our Stars.”

Aside from “TFIOS,” Green is also known for other books like “Looking for Alaska,” “An Abundance of Katherines,” “Paper Towns,” and “Will Grayson, Will Grayson,” a collaboration with David Levithan.

Paper Towns” also had a movie adaptation released recently.

Green has since been named one of Time magazine’s 100 most influential people and also received the L.A. Times Book Prize Innovator’s Award.

Praise for 'Turtles All The Way Down'

The president and publisher of Dutton Books for Young Readers, Julie Strauss-Gabel, had nothing but high praises for "Turtles All the Way Down." She said the new novel compared with the other novels he worked on in the past is also a "singularly personal read and a catalyst for conversation and community.