Nilly is new to the neighborhood, but he is quick to make friends:
Doctor Proctor, an eccentric professor; and Lisa, who is teased by the
twin terrors Truls and Trym. Nilly and Lisa help Doctor Proctor develop
his latest invention, a powder that makes you fart! The powder makes
Nilly and Lisa very popular at school when they sell it for fifty cents
a bag. And they get revenge on Truls and Trym by giving them a dose of
extra-strength powder that shoots them up into a tree. All is good
fun...until someone steals the industrial-strength powder--which was
supposed to make Doctor Proctor famous--to use for evil purposes....