City of Glass starts out with an author of mystery novels mistakenly receiving a call for a detective named Paul Auster. He ignores it at first, but soon takes on the persona of Paul Auster and takes the case. It changes his life and his commitment to the case and the wellbeing of the couple that hired him ends up taking over his existence.
The client is a young man who is currently a poet in the language of God, a language he only knows because his father decided to lock him in a room, expose him to no human language, and see what he said. The father has been locked away for twelve years, and is on the verge of release. His former nurse and current wife hires the author to follow the father and ensure that he will not harm her husband.
I had great hopes shortly after he takes the case, as his research leads to the Tower of Babel, the Fall, and experiments with language, which is an obsession of mine. The language and the ideas were fantastic. Unfortunately, it didn't really go anywhere after that. I ended up bored. The mystery never gets solved, the metafiction aspect began to get tiresome, and I was grateful it was a short novel. I can't really give this my recommendation.