Empire of the Summer Moon was a an excellant read. After moving to Texas some years ago, I began reading everything I could on the Comanche Nation. Unintentionally, I first began reading the more non-fiction type books such as "Comanches" and Comanche Empire. For me, this gave me a baseline of their history that then allowed me to better filter the fiction from fact in the other authors offerings. What really amazes me is lack of interest / awareness of most people today in this area of Texas and of what went on here some 150 years ago. I really enjoy taking short trips to historic sites, either marked or unmarked around central and north Texas. The true history of such persons as Herman Lehman, Clinton Smith and of course Cynthia Ann Parker whom were all captured and lived with the Comanches are fasinating and really good reading.
Here are some recommendations that do fill in the blanks with fiction but are very well done: Captured by Scott Zesch, Ride the Wind by Lucia Robson, Texas Ranger by Jeffery Robenalt.
Not to offend anyone, but in my opinion, the Comanches were the most formidable Ameraindian Nation on the plains.