Clementine cannot believe her ears. Her absolute favorite teacher in the entire world, Mr. D'Matz, has just announced he might be leaving their class to go on a special research trip to Egypt. No other teacher has ever understood her the way he does. He understands her sudden urges to draw all over everything, and he knows exactly when she needs a fun game to get through a long afternoon. To make matters worse, the new substitute teacher has introduced a whole list of strict rules that Clementine simply cannot figure out. Feeling totally frustrated, she decides she cannot just sit back and let this happen. She needs a brilliant plan to get Mr. D'Matz back where he belongs. You will be cheering for this clever third grader as she schemes and plots to save her classroom. This funny and highly relatable chapter book explores what happens when school life gets turned upside down. Join Clementine on a hilarious mission that teaches her important lessons about change, letting go, and writing the perfect letter.