There are two reasons I did not give this book 4 stars. First, it ends in a real cliffhanger, no resolution by the end of the book; it is still not clear what purpose was for the prolog and the first chapter. Second, the further direction of the series is not clear.
Other than that, this is a very solid entertaining book. A very general outline of the plot: a privileged/well-to-do household of Empire's city governor/army general is torn apart by a series of events; now the people are trying to survive. This is as much as I can say without giving major spoilers.
Overall, a good book.