Star Trek-The Original Series: River of Blood: Errand of Vengeance written by Kevin Ryan is the third installment of this trilogy (The Edge of the Sword, Killing Blow, and River of Blood). This trilogy is a Klingon based story, a story of cunning, deception, vengeance, murder, intrigue, and Kahless's truth and honor.
This third book takes up where the second book left off and add a great deal of richness to the story plot. The plot being to kill Captain James T. Kirk by a surgically altered Klingon infiltrator Kell/Jon Anderson. Sworn to destroy the enemies of the Empire... even at the cost of their own honor, Kell/ Jon Anderson is having second thoughts. Why, you say? Well it seems that the propaganda mill of the Klingon Empire is working overtime, and an honorable Klingon does NOT go to war... especially if there is no honor in it, according to Kahless.
We read a lot about honor and truth, but there is guile, cunningness, and knavery also. As the Klingons prepare for a war with the Federation, they need Starship Grade dilithium crystals. A planet is found by the Orions, not too far from the Federation/Klingon boarder on the third planet in Systen 7348, but this planet in inhabited by a pre-warp society... a Klingon-like society.
What I liked about this book is that even though Kirk was to be killed, Kirk, Spock, and McCoy were not the focus of this series... the focus was on how Kell/ Jon Anderson evolved and had second thoughts... a good fleshing out of the character as he and Parrish have a romantic involvement, but Kell/Jon Anderson pulls away as his mission becomes a burden.
There is another interesting subplot in this book and that is Kell's brother Karel as he learns the truth about the war with the Federation. Karel is on a Klingon warship and is a follower of Kahless. Honor and truth are what Karel leads his life by, but there are challanges along the way. There are many roads to Sto-Vor-Kar but only one path as both Kell and Karel learn.
If you like Klingon based stories this is your cup of Bloodwine. This is a fast paced, well-written story and is enlightening about Klingons.
The next series of books to arrive is the Star Trek-Deep Space Nine Mission Gamma. This has four book in the series, (Twilight, This Gray Spirit, Cathedral and Lesser Evil). If you haven't been keeping up with DS-9, might I recommend that you read Avatar Book One and Two by S.D. Perry, Section 31: Abyss by David Weddle and Jeffrey Lang, Gateways: Demons of Air and Darkness by Keith R.A. DeCandido, and Horn and Ivory fron the Gateways: What Lay Beyond. You'll need some background material as the first book in the series draws from these books