Ethel feels stung when the Mertzes are not invited to The Ramsey's dinner party. Sensing Ethel's hurt feelings, Lucy invites Betty and Ethel to a ladies luncheon. It gets off to a rocky start, but Betty and Ethel find some common ground -- Betty hails from Ethel's hometown of Alberquerque. The women became 'thick as thieves,' as Lucy says and now she feels the odd friend out. When an intercom system, connecting the Ricardo's house to the Mertzes' guest house, is installed, Lucy misunderstands that Ethel and Betty are planning a housewarming, , but she's bitterly disappointed when she realizes the mistake. Ethel, who was so fragile at the start of the episode, comes through for her beloved pal in the end.
—gaelicguy