Death lurks below. Will Kane finds a body underneath Hell Gate Bridge. Where this gruesome discovery leads him is a world even he, a New York native, never dreamed existed. Not even in his worst nightmares. No one knows the full extent of the labyrinth that lies below New York City. It's a world unto itself. People, mostly homeless, have made inroads to the more accessible parts for shelter. But there are others who prowl the darkness for their own evil reasons.