Fart Squad #4: The Toilet Vortex (Paperback) (ISBN-13: 9780062290519)

It's the fourth adventure from the belly-bloating, plunger-toting, pants-exploding . . . fearless FART SQUAD This laugh-out-loud chapter book series is perfect for Captain Underpants fans. With black-and-white illustrations throughout and a butt-load of bathroom humor, young readers will be giggling from start to finish.

Something is rotten in the plumbing of Harry Buttz Elementary School, and it's kidnapped Janitor Stan

It's up to the Fart Squad to dive into the toilet vortex to save their scent-sei from the World of the Royal Flush. Grab a match, because this stink just got real. Only the Fart Squad has the guts, the gall, and the gas to flush this round brown mound before he overflows his toilet kingdom on the world.