In a visit to AM to DM , Green talked about pulling from his early struggles with OCD to write the main character of Turtles All The Way Down. In a chat on AM to DM 's The Sit Down on Tuesday morning, best-selling author John Green talked about the ways in which his own experiences with OCD helped him write his new novel, Turtles All The Way Down. The book follows 16-year-old Aza Holmes — who, like Green, has OCD and anxiety — as she tries to solve the mystery of a missing local billionaire. Green said he wanted to write a detective story in which the detective's obsessiveness is "distinctly unhelpful" in trying to solve the case. "A lot of times, detectives are portrayed as obsessive, and that's somehow linked to their observational genius," Green said. "But that's completely opposite to my experience having OCD, which is that when I'm really sick I can't notice anything outside of the world of myself." ...