Its a Valentines Day mystery! Sam is tired of Amy Lou bugging him all the time so he sends her an especially mean valentine. But when the valentines are delivered, Amy Lou gets a nice one from Sam and its their teacher who receives the mean valentine. How did that happen? Joan Lexaus funny story and Syd Hoffs heartwarming illustrations, available for the first time in full-color, are sure to have beginning readers laughing as they try to figure out who pulled the valentine switch.