What a wonderfully researched historical fiction book! I knew about librarians on horseback but learned much more about them in this story. I also learned much more about the 1930s in Kentucky and how much control the mining companies had over the people. Cussy Mary showed such dedication to the people she served, no matter the obstacles, getting as many of the materials they needed to them as soon as she could. She fought racism, domestic abuse, and did her best to help the other impoverished people she met along the way. I found myself rooting for her and hoping and praying for many of the families she helped. The author does not shy from showing just how difficult life was and there were sections of this book that were hard to read because life was so harsh. That said, this was an interesting story that kept me up into the wee hours of the morning.