The book tells an entertaining story set on the Great Plains in the late 1850s, more specifically Nebraska near what was then Fort Kearny. Its main protagonists are frontiersmen named Preacher and McAllister, each of them tough and likable in his own way. It also does well by Crow Indians, including a chief named Broken Pine, a young warrior named Hawk that Soars, and (for comic relief that reminded me of Fezzik in The Princess Bride), a giant named Big Thunder.
Preacher and McAllister are old friends (from previous books in the series, apparently) who work together in this tale to prevent war between the U.S. Cavalry and the band of Native Americans for whom Broken Pine is chief. That an arrogant young cavalry commander and a racist non-commissioned officer whom he is influenced by could have caused trouble through willful misunderstanding is entirely plausible.
I could have rated the book higher had it not had a few "Captain Obvious" moments where the authors used dialog to belabor a point already made. One Indian named Many Pelts is introduced, only to disappear rather than play a role in the story. I would also like to have learned a little more of Preacher's history, such as why he goes by that name and hasn't used his surname in years. All this book tells us -- from his own mouth -- is that he's not the "sky pilot" kind of preacher.
Broken Pine's explanation of the aboriginal attitude toward land -- saying that his people live on and make use of it, but it can't be owned because it belongs to the Maker of All Things -- is the finest moment in the book. Without divulging what actually happens, Preacher's cheerful willingness to face death late in the story is also poignantly described. Lastly, the motto of the publishing house as printed on the paperback edition deserves applause. "Live free, read hard" indeed.