In something of a divergence from his past novels, Green presents a bit of a mystery with Turtles All the Way Down. However, the rest of the story is classic John Green. And it works well. His characters are real and honest. He has created teen characters that are not dumbed down or made overly juvenile. They are thoughtful, mature, and raw. Aza's mental illness is not shied away from, it is made front and center, both in the narrative and from Aza's individual point of view. She is burdened by the illness, but open about its existence and her recognition that there is a problem. I struggled with the concept of Davis's father, feeling as if he was over-exaggerated in a way that made him less believable. Granted, there are people out there who undoubtedly are made of the same character, but it just felt a bit much for me. This was the only thing that pulled me away from the narrative. Beyond this nagging irritation, I found Turtles All the Way Down to be thought provoking, well-written, creative, and enjoyable.