While visiting David's class for a week (they're David's pets and a project for the class on pet-care), Ginger, who's excited about what she's going to learn while in the classroom, and Coby, whose excitement comes from making new friends and eagerly watching students behave badly, find adventure when it's their turn to take care of David. They must find their way out of the classroom and back home so they can deliver something very important to _______________________________their beloved owner.