George and Harold, and their doubles, Yesterday George and Yesterday Harold, have a good thing going. Two of them go to school, while the other two hide in the tree house and play video games all day-then they switch! But when their malicious gym teacher, Mr Meaner, creates a method of mind control that turns their fellow students into attentive, obedient, perfect children, the future of all humanity will be in their hands!

Sprinkles Newman, the local TV meteorologist, is coming to Ella Mentry School! She's going to teach A.J. and the gang all about the weather. But what happens when a real live (well, not live) hurricane comes to the school? Illustrations.

When the teachers of Ella Mentry School go on strike, A. J. and the gang meet a new principal who does not believe in rules and says that the students do not have to learn anything if they do not want to.

When Eva Wingdale sees something large and white flying above her she is convinced that it is a ghost, although most of the other owls just laugh at her--until something large and heavy and white lands on the school roof.

There is an elegant substitute teacher in class today, but Katie's attempts to impress her keep going wrong.

Alexander has just moved into Stermont, but the elementary school is being torn down, his new classroom is located in the hospital morgue, a notebook he finds is full of information about monsters--and everywhere he turns there are spooky balloon men determined to attack him.

Alexander is used to finding monsters everywhere in Stermont, but now the school is being turned into an icebox by giant meat-eating vegetables--and his friend Rip has gone missing.

"A.J. is turning nine, so he's inviting all his family, friends, and favorite teachers over for a backyard birthday bash. His parents even hire a popular party planner, Mr. Marty. But what happens when Mr. Marty accidentally orders rival clowns, a bubble blower, and even a singing cowboy to entertain guests?"--

Alexander and his new friend, Rip, are worried that the worms the rain has brought out are really the megaworms that Notebook of Doom describes but they soon discover that the night crawlers are trying to warn them about the monster tunnel fish that are threatening Stermont Elementary.

In this tenth book, Alexander keeps seeing monsters that the S.S.M.P. has ALREADY defeated! But his friends Rip and Nikki think he is going crazy. Could there be zombie monsters on the loose? Or is there a monster that can turn into ANYTHING? Alexander will have to protect the town -- and the notebook -- from Stermont's latest monster!