I have two different assessments to this book, as an installment of the Anniversary Day saga and as its culmination.
As an installment, I liked the book very much. Down-to-the-wire suspense is difficult to do well, and Rusch does it well, in general and here. Multiple character threads come together, and as we learn more about some characters who earlier appeared peripheral, we in some cases will like them more as well.
As a culmination of this saga-within-a-series, I find the book not quite as successful -- though I hope and guess that some of the many loose threads will be addressed in future Retrieval Artist books, even though Rusch characterizes those coming books as "stand alone" novels. Of those threads that Rusch seems to mean to resolve to some extent, I find the treatment of the "masterminds" disappointingly cursory. The revealed motivation itself, to the extent (not clear) that it applies to most or all of the conspirators, is not implausible (and in fact I'd thought of it as a possibility), but as Rusch handles it, it doesn't quite work as an adequate explanation of the conspiracy as a whole.
All that notwithstanding, I found the way the book pulls threads together somewhat satisfying, despite the issues I've identified.