The zoo switcheroo

"Milton Worthy can't wait for his class trip to the city zoo. But little does he know that Noah the ferret--part time classroom pet, full-time evil mastermind--has escaped his cage and stowed away on Milton's school bus. Good thing that their substitute teacher today is none other than Milton's mom, Mrs. Worthy, secret member of the super awesome Society of Substitutes! Will Milton and his super substitute mom be able to stop the zoo from running completely wild?"--Provided by publisher.