Aunt Bee's friend Selma Plunkett is coming for a visit. Selma invites Aunt Bee, Sam, and Mike to stay at their Palm Springs home for a couple weeks while they're in Europe. At first they decline the offer, but Selma talks them into it. Goober, Howard, Emmett and Millie come by to say hello to Selma. Selma says it's a 5 bedroom house, so they all should go. Everyone makes arrangements to go and Sam just has to go to school to get Mike out of class. Mike informs Sam that he's flunking arithmetic because of his problem with fractions. Mike's teacher tells Sam that there will be another test in one week and if Mike can get a better grade, she wouldn't mind if he went on the trip. Everyone tries working with Mike, but things don't go that well. It's the day of the test and Mike isn't very confident. Everyone is thrilled when they learn Mike did well on the test. They plan to leave the next morning.