Uncle Joe isn't thrilled with the idea of turning the Cannonball's baggage car into a mobile library. He likes even less having to build the library shelves. But after meeting her, Uncle Joe grows extremely fond of pretty librarian Phyllis Marsh. Despite their age difference, among other things, Joe is not shy about romancing Phyllis. Phyllis has to find a way to let him down easy without hurting his feelings, because she is actually engaged. Phyllis introduces her fiance Hal Jackson to Kate. Kate comes up with a plan to show Uncle Joe how inappropriate he and Miss Marsh are as a couple.