Nancy Drew is a sleuth.
While looking after some book in Mr. Burns' library, Lisa found many Nancy Drew books there. She started reading the controversial Clue in the Clock that contains many swear words. This is also the book that Lisa reads as a bedtime story to Homer when he moves into the condo with Julio and Grady in Three Gays of the Condo
When Lisa tried to investigate the secret room at Springfield Elementary, she asked herself "what would Nancy Drew do?". Nancy Drew then appeared in her vision and said she would ask Hardy Boys, but the found out Frank and Joe are dead. Later, Lisa said "what do you think of that, Nancy Drew?", but then imagined her also dead in the grave next to Hardy Boys and Encyclopedia Brown.
- Episode – "Who Shot Mr. Burns? (Part Two)" (Mentioned)
- Episode – "The Mansion Family" (Mentioned)
- Episode – "500 Keys"
- Episode – "Three Gays of the Condo" (On screen)