Ugh. I'm not sure where to start, but I suppose "not recommended" is as good a place as any.
First, the editing is slipshod. The number of times I wanted to reach for a red pen... To be fair, I do have a first printing, so maybe a later printing or edition will have patched that all up.
The concept of the book isn't terrible, it's the clumsy implementation that kills it. What's really happening (kept from the reader) is so painfully obvious early on that by the time the Big Twist was revealed, I was exhausted from rolling my eyes through chapter after chapter of HINT HINT prose, wondering when we'd just get on with it already. (I seem to recall a previous book by this author, The Trellisane Confrontation, having the same transparency issue with its "mysterious plot".)
There is a relationship between Kirk and an original female character that just comes out of nowhere. More so even than those on the original show. It felt as though 3 chapters were missing to explain how that even came to be and why in the world we should be invested in it.
The cringiest of the cringe for me were the racist stereotypes. First we meet a "fiery Latina" stereotype (Panamanian to be precise) with no personality or purpose whatsoever except her obsessive interest in, unhealthy preoccupation with, medical manipulation of, and long-suffering mothering of her antagonistic yet genius husband - who, incidentally, is casually racist toward her in the guise of joking.
Just when my shoulders finally came down from around my ears from that mess, we meet a man with a Spanish name (though actually a faux-Spanish name based on a misunderstood Americanized word that isn't even really Spanish, which shows how much research was put into this) who is - you guessed it - also "fiery". He has a complete lack of emotional control, and is a powder keg of simmering range so all-consuming that no one understands how he ever got promoted. The story tries to save it later by giving him an excuse, but the choice to present the man as Hispanic was telling.
About the time I exhaled from that, a little casual sexism was tossed in, totally unnecessarily, with no consequence to the text whatsoever, as the only female ship captain mentioned in the Federation fleet - who through another bout of shoddy editing briefly is presented as a he before being referred to as she throughout the rest of the scene - manages to not know she's supposed to keep her ship's shields up when in a tense and potentially combative stand-off. This despite every other ship around her keeping their shields up. And it being explicitly stated in a General Order as well. But, you know, women drivers!
Okay, okay. So why 2 stars and not 1? Spock. I think this author's favourite character has got to be Spock, because Spock is quite well presented. His internal struggle with the things he must do, his tendency to play things close to the chest until he's 100% certain the terrible thing he has discovered is true, his verbal sparring with McCoy, and even his internalized frustration at his inability to effectively fraternize with the crew, is all pretty spot-on. I think the author might have done better to write an in-depth novel all about Spock - without trying to give it a mysterious plot.
Altogether, I'd give it 1.75 stars.