It is tonic time in Beverly Hills. Granny's made a batch of extra strong tonic and wants to give it to the local residents. Margaret tells Drysdale that the Countess Maria (Jean Willes) is coming to town for the social event of the year. Maria has leased the mansion next to the Clampetts and Margaret is afraid they'll ruin things. Maria gets a sample of the tonic and loves it. Maria goes to the Clampetts to get more tonic and is attracted to Jed. She wants to throw a party and serve the tonic. Jethro tells them that Mrs. Drysdale poured out the rest of Granny's tonic into the pool. Maria goes to the bank and tells Margaret that she'll be throwing a party for high society people. Maria says that she's inviting the Clampetts and that Margaret is not invited. Miss Jane goes to the mansion to arrange a peace treaty between Granny and Margaret. She drinks some of the tonic and starts to chase after Jethro. The Countess and Humphrey (Burt Mustin), her Chauffeur, pick up Jed to go for a drive. Granny discovers that the tonic in the pool is now perfectly watered down. Maria and Humphery drink some of the perfect tonic. The party Maria throws at the Clampett mansion winds up being a wedding party for her and Humphrey. Susan Hart as secretary Candy Davis.