Along with the ordinary adventures that a 9 year-old commonly finds themselves involved in we also get a glimpse into life in the U.S. and the drastic changes that were taking place during this period of industrialization. After the story is complete there is extra historical information pertaining to the time period complete with photographs of real people and items.
I have been reading these books to my daughters, ages 5 and 7, and they seem to like them. I find myself stopping in the middle of the story though and explaining “the way things were back then” as life without an automobile or even living in a house with 3 stories are foreign concepts to my girls. It is very helpful to have the extra information at the back of the book to refer to. I also enjoy the length of the books as they are usually only a half a dozen chapters which make them excellent for reading a few chapters a night before bed. I recommend them for young girls up to about age 12 although I remember reading them as a teenager as well. And I'm enjoying them again as an adult.