After much difficulty, I obtained a copy of this book, which is out of print and not available on Kindle. I wanted to read it because I happened to watch a very old John Wayne/Roy Rogers movie by the same name. The movie was excellent, and as I watched, I looked up information about it and was intrigued. I have read criticisms that it is racist, but in fact it was reflective of its time period. The book, after all, was published in 1938, a very different time in this country.
It is about a fascinating period of history, during the 1850's and the Westward Expansion, when Missouri had been settled by planters who brought the slave-owning tradition with them. The abolitionists in Massachusetts and other colonies settled Kansas as a free state. There were major skirmishes between the two factions, terrific bloodshed, and outright guerrilla warfare. This book is based on actual historical figures and events that took place in the earliest days of Lawrence, Kansas.
It is well written, well paced, and I recommend it to students of history like me. Be sure to read the forward so you understand the history behind the fiction.