Annabel Andrews is a sloppy 13-year-old junk food freak who gets low grades at school. She has a fastidious younger brother, Ben, whom she calls Ape Face. Her mother, Ellen, expects too much of Annabel. One Friday morning, at precisely 8.15, the girl and her mother say simultaneously: 'I'd change places with her any day of the week. I just wish I had the chance.' It happens! Now each has the opportunity to teach the other a valuable lesson.