This delightful New York Times bestselling chapter book series, from the award-winning author of Pax , is a modern classic that has been keeping readers engaged and laughing as they follow the hijinks of Clementine, a clever and quirky third grader who's the most spectacular friend around. Perfect for fans of Amelia Bedelia and Ivy + Bean! Clementine can't believe her ears: her beloved teacher, Mr. D'Matz, might be leaving them for the rest of the year to go on a research trip to Egypt! No other teacher has ever understood her impulsiveness, her itch to draw constantly, or her need to play "Beat the Clock" when the day feels too long. And in his place, he's left a substitute with a whole new set of rules that Clementine just can't figure out. The only solution, she decides, is to hatch a plan to get Mr. D'Matz back. Even if it means ruining her Mr. D'Matz's once-in-a-lifetime chance, it's worth it—isn't it?