Finally finished this novel. I already enjoyed Reap the Whirlwind very much, but I especially love stories that deal with the aftermath of major events. So Open Secrets really delivered on that side for me, just as much as it sets the stage for the future.
I especially liked Reyes' trial. It wasn't about refuting the charges but about getting to explain why he did what he did. Do the judge and the prosecutor show up again in later books? I got the impression that they weren't quite so happy with the sentence so they could reappear in an appeal...
I definitely appreciated all the emotions surrounding the trial, Reyes' leaving the station, the reactions to his apparent death. I also enjoyed the fact that Reyes' replacement wasn't portrayed as the "villain" taking over from the hero. For now, though, Nogura comes across as a bit bland, if highly competent. So I'm looking forward to him getting a bit more colour.
As much as T'Prynn's plotthread is, for now, divided from the others, it still held my attention. It was very interesting to once again delve into the various facets of Vulcan culture - and is the ritual meant to be some variation of the one applied at the end of Star Trek III? I liked Sobon very much and hope he'll show up again. I wasn't so fond of Pennington's... well, for lack of another word... obsession with T'Prynn. But I guess, after his redemption in his professional life he had to confront his feelings for the one who caused all his troubles - but, I don't know, at some points he seemed a bit like a puppy infatuated with the otherwise so unapproachable damsel in distress. While he serves as identification point for the reader in that everything on Vulcan gets explained to him (and to us), I'd rather have seen him on the station accompanying the trial. I'm looking forward to continuing T'Prynn's story, though. What are her plans now?
Liked the parts advancing the main plot, especially the inclusion of the Tholians. At one point, though, I found myself shaking my head and wondering why all the different factions don't just get it in their head to work together in solving the puzzle and finding a means to fight the Shedai - who are, after all, a threat to all of them.
Loved the allusions to "Balance of Terror", "Court Martial", "Arena", "Star Trek V", the Genesis project, Nogura's keeping an eye on Kirk, Enterprise's "Judgment". Of course, I'm looking forward to seeing the consequences of "Errand of Mercy".
What I didn't like so much was the repetition of past events - for example, reading once about Pennington's past beef with T'Prynn is enough, I don't need to read about that in every chapter he's in.
Overall: It has taken me years to come to this point but I'm really enjoying this series.