Fat Tony and Selma, Marge's painfully blunt sister, fall in love and get married after a whirlwind courtship. Marge has her reservations about the couple's marriage after Selma begins to prioritize her looks and ritzy new lifestyle over her family, so Fat Tony invites Homer and Marge to a weekend getaway at the Jersey Shore. Meanwhile, Bart discovers a special talent that allows him to detect the location of truffles by smell, and Lisa jumps at the chance to capitalize on the rare culinary treasures.