Lizzie, Miranda and Gordo walk into Mr. Dig's class all mad at each other about some incident. Mr. Dig assigns them an historical scavenger hunt in place of a regular test. The former friends find new partners for the hunt: Lizzie latches onto Ethan Craft, Gordo reluctantly teams with Kate Sanders, while Miranda gets stuck with Larry Tudgeman. The trio of teams proceed to search the city for clues that Mr. Dig has left, and the first team to complete the task receives an "A." When Matt finds the assignment in Lizzie's room, he reads that there is "treasure" at the end of the search, so he goes off hunting down clues himself. But Mr. Dig's idea of treasure is not the same as Matt's. Meanwhile, Sam and Jo McGuire realize that they have the house to themselves for a while! So what do they naturally do? Act like kids by having pillow fights, eating messy snacks, etc!
While they are on the hunt, Lizzie, Miranda and Gordo reveal to their partners what the big fight with their friends was all about--it was just a simple mix-up over who was supposed to meet who at what time. All three agree, though, that they are not going to be the one to apologize. After listening, Larry, Ethan, and even Kate all tell them they are lucky that they have such good friends and that it would be silly to break up their friendship over so trivial an incident. The scavenger hunt heats up with all three teams racng for the finish line. Lizzie and Ethan are in the lead, but before they can cross the line, Lizzie stops and apologizes to Gordo and Miranda when they reach the scene. The former friends make up again and all three teams cross the finish line at the same time--only to find out another team has already won!