Frank Carlson Library

"Milton Worthy can't wait for his class trip to the city zoo. But little does he know that Noah--part time classroom pet ferret, part time evil mastermind--has escaped and stowed away on his school bus. Good thing that Mrs. Worthy, ace world-saving, member of the super-secret Society of Substitutes, is along for the ride! Will Milton and his super-substitute mom be able to stop the zoo from running completely wild?" -- Page [4] of cover.

Fiona the Hippo and her friends at the zoo come together to help Mango, a little blue penguin who is stuck on a ledge.