"Turtles All the Way Down" is a poignant and introspective young adult novel that delves into the mind of Aza Holmes, a 16-year-old girl grappling with obsessive-compulsive disorder (OCD) and anxiety. Set against the backdrop of a missing-person investigation, the story follows Aza and her best friend Daisy as they pursue the whereabouts of fugitive billionaire Russell Pickett, motivated by the allure of a $100,000 reward. As Aza reconnects with Pickett's son, Davis, a childhood friend, she finds herself navigating the complexities of friendship, love, and her own mental health struggles. At its core, the novel is an intimate exploration of Aza's inner world, offering readers a raw and unflinching look at the realities of living with mental illness. Green's portrayal of Aza's spiraling thoughts and compulsions is both vivid and deeply empathetic, capturing the often-debilitating nature of OCD with remarkable accuracy. Through Aza's journey, the book tackles themes of identity, self-perception, and the challenge of maintaining relationships while battling one's own mind. While the mystery of Russell Pickett's disappearance provides a narrative framework, "Turtles All the Way Down" is ultimately a story about resilience, connection, and the search for meaning in a chaotic world. Green's characteristic wit and philosophical musings are woven throughout the narrative, offering moments of levity and profound reflection. The novel's title, referencing an infinite regression theory, serves as a metaphor for Aza's thought spirals and the book's larger existential questions, creating a multilayered reading experience that resonates long after the final page.