What purpose does Christopher's long discourse on the Hound Of the Baskervilles serve?

Christopher's long discourse on "The Hound of the Baskervilles" in "The Curious Incident of the Dog in the Night-Time" serves to highlight his affinity for detective stories and logical reasoning. It showcases his intelligence, attention to detail, and ability to analyze complex narratives. Additionally, it serves as a coping mechanism for Christopher to navigate the challenges he faces in his own life.