WILLY AND PETER love bean dip, boogers, and smelling up school buses. But a search for a birthday gift for little sis lands them in a big stink. Captured by mad clowns, the boys unmask a putrid plot to destroy the world with Weapons of Mass Flatulation. From flying camels to stormy seas, can Willy and Peter out-gas the evil clowns? Can they save humanity from ex-stink-tion? And still get home in time for their sister’s birthday? Note that this is the US spelling edition.