Estimated Ship Date: June 17, 2025

When the Ella Mentry School boys' bathroom floods, Mr. Plummer—the world’s weirdest plumber!—plays detective and tries to figure out if A.J. and his friends are responsible in this eighth book in the sixth arc of the My Weird School series, which has sold more than 36 million copies worldwide across all arcs.

A.J. and his friends are listening to parents talk about their jobs during Career Day at Ella Mentry School, when suddenly, the fire alarm goes off. But there’s no fire—there’s a flood in the boys’ bathroom!

It’s way too big of a job for Miss Lazar, the custodian, so the school calls in a plumber named Mr. Plummer. But will Mr. Plummer be able to use his amateur detective skills to figure out who caused the flood in the first place?