Former childhood friends Sarah Inman and Ron Johnson have drifted apart in high school. Ron hosts open parties every Friday, but Sarah never attends, preferring to stay home with her homework and dismissing her classmates—especially popular class president Bill Tyler—as shallow. Her aloofness has earned her a reputation as a snob, though she doesn’t realize it. When Ron reluctantly invites her at his mother’s urging, Sarah agrees to go, setting the stage for a clash between her world of isolation and Ron’s world of popularity.

Don and Nicky head into the city, where a reckless night with two fast girls leaves Don with more than he bargained for. Pressuring his girlfriend Betty into sex, he unknowingly passes along a venereal disease. When the school doctor diagnoses him with syphilis, Don must face the shame of his actions and warn Betty—before it’s too late.