Get a Clue! — Lisa Banim

Someone has been leaving creepy notes in lockers, notebooks, and knapsacks all over school, with messages like I Know What You Did Last Week. Students are getting really annoyed. And the notes all appear to be written by one person-Lizzie McGuire! But who would want to frame Lizzie for such a totally bizarro prank? Time for Lizzie to track down the guilty party before she's exiled to Loser-ville forever!