The Greenbush twins step into the spotlight in this light-hearted episode about imaginary friends.
It all starts when Charles and Jonathan, to earn extra money, take jobs on a telephone crew in southern Minnesota. The job will require them to be away from home for weeks.
The 6-year-old Carrie constantly wonders when her Pa will be home. Longing for her father even before a few days pass, she turns to Laura, Albert and Caroline to keep her occupied, but they don't have time for her because of extra chores. Grace is still too young to play with Carrie in any meaningful way, Andy is also extra-busy with chores, and of course Nellie and Willie won't associate with her.
So, to ease her lonliness, the heartsick Carrie creates a make-believe friend named Alyssa. She turns her lonely hours into exciting adventures - 6-feet-tall strawberries, finding a penny that is large enough to sit on, and traveling to Heaven and meeting up with the Ingalls' deceased pet dog, Jack. While in Heaven, she also runs into St. Peter, who kindly tells her Pa will be home soon.
Charles and Jonathan, meanwhile, find the housing conditions deplorable, and Jonathan never can see eye-to-eye with the crusty crew foreman, Mr. Swaggart. The weeks pass, and the crew finally finishes their work. Charles, who has sworn off alcohol, agrees to imbibe along with Jonathan and the fellow co-workers, but the whiskey has been bootlegged. Swaggart's assisstant, who brewed the whiskey, remembers – albeit a little too late – that all the highly-combustable supplies were stored in Mr. Swaggart's office. The shed explodes, and while no one is hurt, Mr. Swaggart is plenty peeved and the assistant has plenty of explaining to do.
One afternoon, Carrie finally sees her Pa come home and the two embrace. Carrie shares her exciting adventures with Alyssa, but Charles tells her that she just made Alyssa up because she missed him so much. Charles then tells his second-to-youngest daughter he loves her very much.