This book is technically six books, all revolving around the concept of the Klingon Day of Honor. We visit four different ST series in this book: TOS, TNG, DS9, and Voyager. While each book has its pluses and minuses, I have the same complaint for many of them that I had for many other Star Trek books. Build up, build up... crash to earth with a one chapter conclusion.

Ancient Blood: This book is the TNG entry, with Worf dealing with both the Day of honor and an undercover assignment. The crossing storylines make it interesting, though can get confusing as chapters alternate.
Armageddon Sky: This book is the first DS9 entry and one that deals with the Defiant going to a contested planet to work with the Klingons to fend off the Cardassians. This brings others the concept of the Day of Honor and shows battles with unique battlegrounds. One of my favorites in the book.
Her Klingon Soul: Voyager has its first entry here, with many questions happening, and showing B'Elanna's regular bad luck with the Day of Honor. It adds
Treaty's Law: The only entry from TOS, we see the creation of the Day of Honr, as Kirk helps Kor defend a planet the Federation lost in a treaty against the attacking Narr. I found this had too many shifting perspectives. Made it difficult to read.
Day of Honor: This is the novelization of the Voyager episode of the same name. Deeper into the Voyager Mythos, meeting the Caatati, the lost warp core, the exploding shuttle. This doesn't shift perspective as much. My second favorite of the group.
Honor Bound: This is the final selection in the book, and it deals more with Alexander's honor and his perspective on the Day of Honor. I'm not entirely certain I would agree that this is a DS9 novel, but it does highlight the issues of bigotry and stereotypes that we tend to cling on when caught with unknown circumstances. ( )