^ Yes! They wanted to move to a different town, but the kids said no. So they moved into a small house -- the complete guide says it's Mystery #17, which makes sense with my memory of it being a subplot to a character who was in California at the time and it totally making no sense.
Mallory and the Dream Horse. I just flipped through about 10 different books because it was driving me crazy. All I could remember was that Dawn was the one who pulled it out of the dryer and it shredded, but it wasn't her book. Which, you actually said in your post, so .. go me? :-D