"Cussy Mary Carter is the last of her kind, her skin the color of a blue damselfly in these dusty hills. But that doesn't mean she's got nothing to offer. As a member of the Pack Horse Library Project, Cussy delivers books to the hill folk of Troublesome, hoping to spread learning in these desperate times. But not everyone is so keen on Cussy's family or the Library Project, and the hardscrabble Kentuckians are quick to blame a Blue for any trouble...

It is 1936 and Kate Merritt works hard to keep her family together. Her father slowly slips into alcoholism and his business suffers during the Great Depression. As her mother tries to come to grips with their situation and her sisters seem to remain blissfully oblivious to it, it is Kate who must shoulder the emotional load. Who could imagine that a dirty, abandoned little girl named Lorena Birdsong would be just what the Merritts need?

While staying with her Aunt Millie in the Appalachian Mountains of Kentucky in the summer of 1934, Kit tries to discover who is sabotaging a visiting folklore researcher.