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.
When strict Mrs. Derkman moves next door to third-grader Katie Carew, scares her friends away, and insists she keep her dog, Pepper, on a leash, Katie finds a non-magical solution to the problem. Includes steps for teaching a dog to sit and stay.
Although reluctant at first, the second graders in Mr. Hopper's class follow new student Luna's suggestion and perform as stars in a "midnight circus" on Family Night.
It's almost summer vacation and the students in room 2B are having trouble concentrating on their butterfly project, until a frightening-looking new teacher comes to supervise the Suspension Room and Harry is sent there as punishment for unruly behavior.