Larry, a retired trial lawyer, sets out to solve a family mystery ... uncovering the identity of an ancestor, a man named Smith, who purportedly fathered the first white child born in a deep and uninhabited valley near the Idaho-Montana border, then did "something so bad, he got himself rode out of town." Larry soon identifies the first white child ("they called him Billy") as well as the child's mother ("her name was Henrietta"), but uncovering the...