"City of Glass" is a novel by Paul Auster that blends elements of mystery and metafiction. It follows the story of a writer named Daniel Quinn, who receives a phone call meant for a detective named Paul Auster. Intrigued, Quinn decides to take on the case, leading him into a labyrinthine exploration of identity and reality. As Quinn delves deeper into the investigation, he encounters a range of characters and situations that challenge his understanding of himself and his role as a writer. The narrative raises questions about authorship, perception, and the nature of truth, making it a thought-provoking read.