I’m reading the Little house books to my kids now at bedtime. I wanted them to realize that the “olden days” is not just when Mommy was little. There are some great lessons there for kids-and adults- like being satisfied with what you have and grateful for the extras (like candy). Even the non-Jewish things- like how Sunday is described, was a springboard to show how different and beautiful our true shabbos is.
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But although I love kids’ books, there are adult books out there that are Kosher. I mentioned Austen because even though her books usually involve some female heroine and her romantic hopes, they were written in a time when morals were quite different, and they are sweet and innocent.