Turtles All The Way Down by John Green
Quote: "Most adults are just hollowed out. You watch them try to fill themselves up with booze or money or God or fame or whatever they worship, and it all rots them from the inside until nothing is left but the money or booze or God they thought would save them."
Blurb: Sixteen-Year-Old-Aza is trying to be a good daughter, a good friend and a good student. She's also trying to track down fugitive billionaire Russell Pickett, who has vanished without a trace. Alongside her Best and Most Fearless Friend, Daisy, Aza sets off in pursuit of the truth- and a $100,000 reward.
The trail leads them to Pickett's son, Davis, a sometime friend of Aza's who might have the clues they need. But as her compulsive thought spirals take an ever-tighter grip on her mind, Aza finds herself struggling to keep her investigation- and her life- from falling apart.