Eight keys to Eden

Mid-century sci-fi novel about a planetary colony that goes dark. When the rescue mission arrives they find the colonists running around naked without any technology. There is a plot to arrest the colonists and the super smart “E” assigned to rescue them for indecency, of all things. The big reveal at the end is unimpressive and not worth the effort. It’s mostly just a speculation on how there could be an intelligent existence that operates outside the world of science and things.