This is a set of three urban fantasy novellas by Mercedes Lackey. The first (and longest) is the first new Diana Tregarde story in years
, and it is set when Diana is just starting college. All three stories have introductions by Mercedes Lackey, giving a short rundown of certain world-chronology elements (mostly detailing the differences between the time frame of the story and the present day; there are quite a few!).
All in all a fast and enjoyable read.