If you're a fan of murder mysteries, this could well be entertaining. Having worked in DC for over a decade, it was very interesting for me to see all the local landmarks and hangouts - but from a very different perspective. The perspective is very slightly left of center, and is very much from an elite strata of society, not at all the mundane view of average or even moderately upper level Washingtonians.
It could very well appeal to those who loved to watch Dallas. The plot was slow to develop, and convoluted, but eventually came together (somewhat predictably - because the book was coming to a close) right toward the end. In great "Thin Man" tradition, after the murder(s) were solved, the protagonist and his witty, intelligent and beautiful wife went on a Paris getaway, and enjoyed entrecote (yeah, had to look that one up too) and petit fours as they wittily wrapped up the sub-plots.