I was recommended to read this series from a gentleman while I was visiting the Museum of Northern Arizona in Flagstaff during my archaeological field school. I wish I'd gotten the guy's name, because I would love to thank him for introducing me to this series.
One reason I never read books about Native Americans written by a white person is the fact that it is really easy to screw up important details about the overall culture. Hillerman clearly spent a lot of time on the Diné reservation, and also appears to have mostly done oral research. I say this because some of the spellings for Diné Bisaad words are a little funky. The word that struck me as being particularly odd is the word "Diné" itself; in this book, the word is spelled "Dinee," a spelling which I have never seen in any other publication.
While the plot itself dragged in some places, the overall story was highly engaging and interesting. I highly recommend people read this book and hope it encourages people to visit Native American reservations and learn more about the beautiful cultures that may soon be lost due to hegemonic influences.