Octagon Magic

Recently, I've been having a longing for books I read in early to late childhood and have experienced both the desire to reclaim them again, and the fear that they won't be the same as they are in my memory. One of the earliest stories that hooked me on mysteries was Peggy Parish's Key to the Treasure, but now of course, I'll read it with an eye to how it interprets and represents native American culture and history. I once read an extremely creepy story called The Tibetan Box, but I can't recall the author's name--I only remember the nightmares, and the desire to be scared like that again. Why? What was in the box? I can't remember! And then there was a story about a dollhouse that came to life and the characters who lived inside it. I could never get the story quite right in my memory, but after a gap of decades (!) I remembered the author was Andre Norton and the story (book?) was called The Octagon House. Wrong. It was actually Octagon Magic. I've tracked several of my old favourites down through Abe Books, and I'm about to find out whether childhood is better left alone. Wish me luck!