This was a nice ending to the trilogy. It dealt with the continuing saga of the Triad, and the threat placed against Simon and Gray's family. We also got to see more of Liam and Cormac. The strength of this series, IMO, is the different way it looks at different types of magic. In this particular story we get to see a bit more about that and about why the different types of magic are isolated from one another. 
 It was a nice conclusion to an interesting series.