When Ella Mentry School holds a science fair, Dr. Snow arrives to help A.J. and his friends conduct their experiments.

When Ella Mentry School invites a local dentist to speak on National Dessert Day, A.J. and his friends uncover the dentist's secret plot to promote cavities for more business.

A.J. is planning a big birthday to celebrate turning 9 and his parents even hire a party planner named Mr. Marty. Mr. Marty orders some weird stuff to celebrate though.

Test scores are low and stress levels are high at Ella Mentry School. Wellness expert Ms. Jo-Jo has come to help A.J. and his friends relax so they can ace the upcoming Fundamental Arithmetic/Reading Test. But can turtle yoga and crystal salt lamps really help A.J. and his friends relax and focus? Or will the F.A.R.T. end up blowing them all away?

"After noticing that A.J. and his friends' geography knowledge could use some work, Mr. Cooper invites to class just the person to help. Globetrotter Mrs. Barr speaks seven languages and has visited nearly two hundred countries! But why does she carry a suitcase everywhere she goes? And why does she open a window whenever she walks into a room? Perhaps Mrs. Barr has something to hide"--Provided by publisher.

"Mr. Klutz is retiring! (A surprise even to him, courtesy of scheming Dr. Carbles.) Vice principal Mrs. Jafee thinks it's her time to shine, but Dr. Carbles has hired someone else for the job! Stand-up comedian Mrs. Stoker is ready to defend her place as principal in a joke-off against Mrs. Jafee. Will Mrs. Stoker have the last laugh? Or will she lose her audience when things get serious?"--