I think I might be the last Kate Daniels fan to pick this novella up; I like Derek but I don't love Derek. I do love Julie though, and Julie and Derek together, so when I found out Magic Stars is really about the two of them, I ordered it.
Short, but complete, with a fairly decent plot that felt a tiny bit unbelievable even for a UF. I know, Julie is a witch and lived on the streets, and yada yada yada, but she's 16 and was gone 2 nights and neither Curran nor Kate (or any of the others) noticed? It felt odd. I loved the dialogue between Derek and Julie - for me it was the best part of the book.
The actual plot was a stretch but served as a nice passive-aggressive way of telling fans that yes, they do belong together, but she's still jail-bait so have some patience. ;-)