A.J. and his friends are afraid that Ms. Todd, their substitute teacher, has killed their regular teacher and is trying to take over her job.

When Mr. Granite falls ill, A.J. and the gang endure a wacky week with a perpetually cheerful substitute teacher who wears a clown costume, uses hand puppets to talk, and uses magic tricks to saw students in half and make them disappear.

New third grade teacher Mr. Granite has so many strange ideas about how to make Ella Mentry School environmentally friendly that the students are sure he must be an alien.

"For A. J. and the gang from Ella Mentry School, a night of regular trick-or-treating turns into the weirdest Halloween in the history of the universe"

"When Miss Daisy returns to Ella Mentry School as a substitute teacher, the kids are in for a weird and wacky day of not learning about math, writing, the weather, and more"--

A.J. and his friends get a Personal Digital Assistant named Miss Porter as a substitute teacher, who can order pizza and tell endless jokes, but grows power-hungry when her system is changed and tries to take over Ella Mentary School.

A.J. and his friends are forced to take classes even during recess, but their teacher, Mrs. Lizzy, teaches how to make balloon animals and all sorts of other strange things. Ella Mentry School's newest teacher, Mrs. Lizzy, has some very strange ideas about learning during recess. Book #9.

"There's a new principal at Ella Mentry School. Yes, it's true! Mr. Klutz is retiring and the president of the Board of Education, Dr. Carbles (Boo! Hiss!), has hired the best person for the job -- or at least the funniest. But stand-up comedian Mrs. Stoker will have to face Vice Principal Mrs. Jafee in a big joke-off duel to defend her new job. Will Mrs. Stoker have the last laugh? Or will shoe lose her audience when things get serious?"--