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Katie's teacher, Mrs. Derkman, hopes to win the Teacher of the Year contest, but her chances do not look good when Katie turns into her teacher and cannot keep a class full of out-of-control third-graders in line.

Katie and her friends, worried that Mr. G is leaving Cherrydale Elementary, devise a plan to convince him to stay, but when they put the plan into action, Katie learns his secret and realizes she and her friends have made a terrible mistake.