Janet's friend, Adelle Colby, arrives in the valley. Sam, Bert and Uncle Joe are each attracted to her. Adelle, a librarian, is in the valley to open up a new library. They have the books and the money, but now need a location. Janet suggests a mobile library in the form of the Cannonball. Sam, Bert and Uncle Joe do whatever they can to spend time aboard the mobile library to be with Adelle. This competition causes a rift between the three friends. But it's Wendell that has the upper hand in attracting Adelle's attention.