It's summertime, and the young, popular crowd, home from prep school and college, are looking to have fun. Unfortunately for Marjorie Harvey, her dull cousin Bernice is visiting for a month. Even though Marjorie is one of the most popular girls in town, nobody wants to hang out with poor Bernice, whose conversation is mostly limited to painfully awkward inquiries about the weather. Marjorie and Bernice may be cousins, but they couldn't be less similar – they're not friends, and they simply don't understand each other. Bernice doesn't really get the fact that she's a real snooze, and can't see why guys don't like her as much as other girls. She gets a hint as to why when she overhears a conversation between Marjorie and her mother, in which Marjorie comes out and says what's on everyone's minds: Bernice is just plain boring.