First things first: This isn't a standalone series; don't read this if you haven't completed the Odyssey One series by the same author, all the way through book 7. Otherwise, nothing will make sense, and you almost certainly won't enjoy it.
That said, it's challenging to define this series, as it's not exactly a spinoff either. While the main story arc is essentially on hold, there is ample information provided to the reader that you wouldn't want to miss, involving the main story arc and key characters and their development.
Prominently featured in this book are Steph Michaels, Milla Chans, and the Archangels. There's also almost as much space dedicated to newly introduced characters, of which there are quite a few.
Michaels remains among my least favorite characters from the Odyssey One series, and unfortunately, this book does nothing to change that. Everything he (and other members of the Archangels) does is either deemed "crazy" or "insane" and is always done with a smirk or a grin. It's like Top Gun's Maverick on steroids but without any of the charm.
Milla Chans could have been a fascinating character for obvious reasons, but her character development in previous books was minimal, and this book fails to alter that trajectory. She tends to solve problems by pulling a rabbit out of her magician's hat. Additionally, she serves as the character to point out that Michaels and/or the Terrans are insane and crazy, ad nauseam, throughout the entire book.
Needless to say, this all becomes tiresome quickly. If you expect or hope to read this book for character development, you'll likely be very disappointed.
Story-wise, it's a bit better. While not overly original and at times an obvious maneuver to stall progress on the main story arc, there are interesting new developments, for instance concerning The Empire and, well.. no spoilers here. The pacing overall is adequate, although it slows down a bit too much for the final encounter, lasting nearly a third of the book but playing out in only a fraction of the time compared to the other two-thirds.
All in all, not great, but decent. If you enjoy the Odyssey One series, there's no reason to skip this, and it's probably best not to. You might even consider it a continuation of the Odyssey One series with a slight shift in focus.
The author appears to have become somewhat lazy on various fronts. Character development is nonexistent at this point, and what we do get only stretches what's already very shallow, rather than delving a little deeper. The need for technology to make logical sense has all but disappeared, with more and more "magic" creeping in whenever it's convenient.
This series as a whole really needs to come to an end.
Rating: 3.5/5, rounding down.