Grab your mop and get ready for the messiest adventure yet at Ella Mentry School. The building has a new custodian, Miss Lazar, and she operates completely differently from anyone else. Instead of just sweeping the floors quietly, she actually likes to dance around the hallways with her cleaning supplies. She even claims that cleaning up giant messes is the most fun job in the world. You will follow A.J. and his friends as they investigate the strange rumors surrounding their new custodian. The kids hear that she might have a secret room hidden deep down in the basement where she keeps students who misbehave. Naturally, A.J. is determined to find out if the rumors are true, which leads to a lot of sneaking around and hilarious misunderstandings. This laugh out loud story drops you right into the middle of a very weird school day. It is full of silly antics and the kind of goofy mysteries that make reading a blast. Get ready to explore the hidden corners of the school with a group of friends who always manage to find trouble.