The Manhattan hunt club.
In Manhattan Hunt Club John Saul plumbs the depths of the Manhattan underground--the network of subway tunnels and secret caverns and chambers where the homeless denizens of the city have created their own society. It's a world Jeff Converse, a young college student convicted of a crime he didn't commit, never knew existed until he is plunged into it after an "accident" that occurs while he is being transported to prison.