It’s Friday afternoon. The Stonecreek Science Fair is over, and Agnes Pflumm has two days to come up with a cool new lesson for her 6th grade science class. 

She decides to embark on a lesson on pond water microbiology – with borrowed equipment.

But poop in the stream, dead fish, frogs with missing hind legs,

alarmed students, and the return of Edward Fartlesnap

make this a lesson that  changes the town forever!