Sadie and Isabel are Anna's two best friends, and Anna can't wait to go with them on the class field trip to the zoo; however, when they start choosing opposite sides on everything, Anna feels caught in the middle. Sadie wants Anna to see the spiny anteater with her, but Isabel wants to visit the tortoise instead. When Isabel pulls Anna toward the camel house, Sadie yanks her toward the giraffes. It's like they're playing a game of tug-of-war and Anna is the rope! How can Anna keep the peace without causing double trouble?