I am an enormous fan of the Nightrunner series and I have the utmost respect for Ms. Flewelling, but I am afraid I found this book a big disappointment. I felt this on the day I recieved it, eager to read, but after my initial reaction, gave it some time and reread to make sure it wasn't just overexpectation. Unfortunately, it was not.
Shadows Return lacks the deep characterisation and detailed descriptions of the first three books, and is filled with repetition of, 'Can I escape now? No, not yet,' rather than the action we are used to. I was also dissapointed that Alec and Seregil spend such a huge part of the book apart. Part of the magic is seeing their reactions to each other and how they work together, and this was impossible when all they could do was think about each other. The lack of knowledge about the country (trying to avoid spoilers here), while understandable in their situation, also detracted from the believability that came from Skala's, Mycena's and Aurenen's more elaborate structures.
Finally, there were several errors that were big enough to break me out of the world they were inhabiting. Certain details about Amasa and the Aurenfaie language, in particular. They still irk me, in fact, because it makes me feel that I don't really know this world anymore.
Apologies to Ms. Flewelling if she reads this. I truly mean no disrespect and I know the effort that goes into writing and continuity between texts, but I truly hope that The White Road is back up to the standard of the first three books.