In The Goldfish Boy by Lisa Thompson, twelve-year-old Matthew suffers from OCD. He is afraid to leave his bedroom where he has complete control over how clean the space is. Matthew spends his days looking out his bedroom window at the neighbors in the cul-de-sac, cleaning his room, and recording what the neighbors are doing in a notebook.
One day two small children come to stay with his next door neighbor, their granddad, for the summer. The young girl, Casey, calls Matthew the goldfish boy because he stays behind his glass window watching but never interacting with the neighbors.