The problem with this book is its an experiment. As such, it’s hard to market, so they’ve labelled it as part of the ‘RCN saga’. While it’s set in the same ‘world’, against the backdrop of an uneasy peace between two galactic empires, recently at war, and uses the same technology, the book has no characters from the previous series, and doesn’t follow the evolving political situation, both domestic and foreign. Neither is it a mixture of military sci-fi and espionage that featured in the previous books.
Instead it’s an explicit homage to the adventures of naturalists in the 19th century. As such, it’s inherently episodic in nature. As a consequence, it’s structured like a short season of a tv show. In the first couple of episodes, in which the main cast, some minor characters and the season arc are introduced, then there’s a couple of mostly unrelated episodes in which the minor characters are barely mentioned, then the last couple of episodes where there’s a couple of set pieces, the minor characters are brought back and the season arc is completed.
Which isn’t to say it’s bad. It’s very entertaining, and the action flows nicely. What costs it a star is the feeling like the ‘show’ was cancelled after 1 season, but the studio allowed the showrunners to tack a final scene on to give closure. It just feels like it ends abruptly, like it was forced to end, instead of finding a natural ending. Again, this is probably in line with how the records of the naturalists that inspired it end, but it feels unsatisfying. Fair play to the author for trying something adventurous, though.