Emmy and the Incredible Shrinking Rat by Lynne Jonell
This book had me laughing out loud! The sarcastic humor of the characters brought this fantasy tale down to earth. Emmy's parents literally changed overnight. After they received a huge inheritance from a distant relative, they dumped the bookstore they had worked so hard on, moved into a fancy mansion, quit all family activities and started jet setting all over the world....leaving Emmy ignored, lonely, and trying so hard to win back the love of her parents. And until the day she hears the class rat actually speaking to her, she never believes that there may be more going on than she would ever think possible!