The book became a best seller for Simon & Schuster. There's a critical review of it at Indian Country Today that I urge you to read. I wonder if Kate Waters (she's doing the young readers edition) or her editor at Simon and Schuster read that review?
The review's title captures the problems with the book: The Heart of Everything That Isn't: the Untold Story of Anti-Indianism in Drury and Clavin's Book on Red Cloud and links to a review by Tim Tiago, too.
If I get a copy, I'll be back with a review.