TrekBBS user JD found some new blurbs on Amazon, and in subsequent discussion author Dayton Ward provided the final blurb for Vanguard: Open Secrets. Here are those blurbs:
Vanguard: Open Secrets
The Taurus Reach is in turmoil.TNG: Losing the Peace
With tensions mounting between the Federation and the Klingon Empire, Ambassador Jetanien works frantically on Starbase Vanguard to halt the escalation toward war. Commodore Diego Reyes, the station's former commander, awaits trial for treason, while the shattered mind of his intelligence officer, T'Prynn, becomes the battlefield in a fight for her very life.
But even as matters deteriorate, the discoveries made in the Taurus Reach have attracted one of the Federation's most promising scientific minds: Dr. Carol Marcus believes she is close to solving a puzzle that will transform her life's work. Meanwhile, an unexpected defection brings a new perspective to the investigation, and Vanguard's Lieutenant Ming Xiong is confronted with an artifact that could be the key to decoding the Taurus Meta-Genome.
With Operation: Vanguard teetering between its greatest breakthrough and a conflict that could engulf two quadrants, its future may depend on the man Starfleet has selected to replace Reyes as base commander: Admiral Heihachiro Nogura.
Fortune has smiled on Lieutenant Jasminder Choudhury, chief of security on the USS Enterprise. She has survived. But her homeworld, Deneva, one of the planets targeted in the massive Borg invasion, has not. The entire surface has been wiped clean, killing anyone who was not evacuated in time and rendering the planet uninhabitable. She does not even know whether her family is among the displaced -- or are they gone forever? All across the galaxy similar stories are being repeated. Hundreds of thousands of refugees haunt the spaceways, seeking comfort, looking for some place safe, somewhere, anywhere to find solace. For the first time in generations, citizens of the Federation know want, uncertainty and fear. Bloodied yet unbowed, the Federation stands on the edge of a precipice. As he battles to rescue the displaced and the desperate, Captain Jean-Luc Picard is forced to wonder if those who can win a war well can rarely make a good peace.TOS: Troublesome Minds
First contact becomes an interstellar incident when the Starship Enterprise responds to a distress call from an unknown ship and saves the life of a man left to die by his own people. Berlis, a member of a telepathic species calling themselves the Isitri, claims not to know why those from his homeworld would want him dead. Captain James T. Kirk wants to believe him, but the damage is done: the Enterprise can neither leave the stranger to die nor turn him over to those who would kill him. Berlis seems harmless, but his people say he cannot live among them: his telepathy is so strong that their wills are subsumed to his. The same fear that compels the Isitri to seek the death of one of their own drives the neighbouring Odib people towards genocide. For every time an 'alpha mind' dominates the Isitri, the Odib pay the price in their own blood. With Spock becoming erratic under Berlis's influence, and the Isitri begging Kirk to allow them to destroy the man who threatens their existence, matters take a disastrous turn when Berlis makes his way back to Isitra -- and an entire world falls to his whims.