The beginning starts off a little confusing about what the role of the characters is, but once you get into it around page 40 or so, the action begins to take off. You follow two main characters around: Jon Kessler and Detective James Mercado, both employees of the City of New York, as they unwind a major development conspiracy (no more spoilers) using information from the NYC sewer system. yes, the sewer system. The author is a sanitation engineer and knew a lot about how the sewage system, including the corruption, works in the city, especially Manhattan, where the novel takes place.
I can't think of any other murder mystery thriller based on knowledge of any city's sewer system, so for that reason this book stands out if you want something different. The narration is a little heavy to read at times (meaning too much of it) but overall I found this to be a great book.