Some context - this series and author were something I'd found in a forum discussion two years ago, found it an interesting concept, and picked up all five volumes. The earlier ones were a little rough around the edges (as are many early-career novels), but were engrossing enough and definitely improved as the series rolled on (better dialogue, better character development, more expansive and interesting world-building).
I had thought the overall narrative and character arc were relatively complete after the fifth book, and with sixteen years gone since its publication I will admit I did not expect a continuation of the series until the author's announcement of an upcoming title, so I picked it up to read on my Kobo. This volume was a bit of a slower start, and had a few moments of over-focus on the bureaucratic process aspects of "document examining" that felt like a brief return to the first book, but mostly felt like it fit with the latter books in the series. There's a definite (mild) reliance on the history and character development from the previous books, so I don't recommend it as a starting point, and it doesn't spend as much time really developing the locales or setting the scenes as I'd like. Overall it's a worthwhile addition to the series that _might_ be opening up a new arc - time will tell!