Although I read many of The Hardy Boys books in my later youth (my school discouraged reading Enid Blyton and these books so I had to catch up on them a later) I just picked up one about two months ago to read. But I had never really scratched under the surface of the series’ and this article sheds a bit of light on “who” Carolyn Keene and Franklin W. Dixon actually were.
See mentalfloss.com/article/576576… and some facts on The Hardy Boys at mentalfloss.com/article/66089/…