Keith enrolls in a Sociology class in college and discovers one of his favorite subjects, a beautiful girl, 23-years-old, Dory Kimmel. He maneuvers his way into working on a class project with her. After a study session with Dory at the Partridge home, Keith announces to his mother that he's finally found true love in an older woman, Dory. As their work together continues, Keith becomes completely infatuated and believes that Dory feels the same way about him. But he's totally stunned when he learns Dory is married. An unhappy Keith confides to his mother that he thinks Dory is going to leave her husband for him. When Shirley confronts Dory with this bit of news, it's Dory's turn to be stunned. She likes Keith as a friend but she's truly in love with her husband. She has to find a way to tell him the truth without hurting his feelings. Dory finally decides to invite Keith over for dinner to meet her husband and see how happy they are; Keith arrives for the dinner, expecting Dory's husb (thetvdb.com)