After the stress of her last attempt at taking her class on a field trip (seen in First Year Letters), 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?