Aza has some mental health issues. She has what she and her therapist describe as intrusive thoughts. Voices tell her to avoid situations that can introduce germs into her body. This leads at one point to her drinking hand sanitizer. It makes kissing problematic. She also has a festering wound on her finger where she has picked off a callous. She constantly changes the plaster on this and obsesses about keeping it clean.
Alongside all of this she is a normal adolescent, struggling with relationships, with her mum, her best friend and almost boyfriend, Davis.
In addition we have a mystery story. Where has Davis’s father disappeared to? Billionaire Russell Pickett has gone into hiding as the law is onto him. Davis has to care for younger brother Noah.
As ever, John Green offers us a character with whom we can empathise.
At the end of the book is a list of organisations that can help those who suffer from mental health problems.