LadyTink has brought this movie to my attention. I thought that The Moon-Spinners was the only Mary Stewart book that had been made into a movie. I was oh-so-wrong. The Crystal Cave was apparently adapted into Merlin of the Crystal Cave in 1991. Here's the imdb page.I've looked around at all my local libraries and no one seems to have a copy (not too surprising, I guess). Has anyone seen it? There appears to be a used copy on Amazon for $3. Is it worth it?