All the states of the northeast are dark blue and so on. I used the Flesch-Kincaid Readability Scale to find the readability of each book. To see a list of the books and their readability click HERE . If you would like to learn more about the Flesch-Kincaid Scale, you may click on either choice 1 or 2 . I would not rely on the scale alone to help you judge the reading level of each book.
Many stories use simple language to deal with very serious issues.