Sarah Jane Hartwell is back with a whole new grade-school challenge: a class trip to the zoo. After the stress of her last attempt at taking her class on a field trip (seen in ), Mrs. Hartwell has a plan for an upcoming trip to the zoo—a plan that includes lots and lots of rules. Armed with her foolproof field-trip tips, she's determined that absolutely nothing will go wrong. Sure enough, her students prove that they can line up straight, walk quietly, and take plenty of notes—but everyone soon realizes that the hotly-anticipated trip is becoming a letdown. Can Mrs. Hartwell save the day from herself?