While in San Diego doing a USO show, Lucy, Ethel and Fred head to Mexico to shop but return with an unexpected stowaway in the trunk which causes problems at the border. Maurice Chevalier guest-stars as himself.
Lucy and Ricky sublet their country house to the Williams family of "Make Room for Daddy", but when their vacation plans are put on hold and they've got nowhere to go, they move in with the Mertzes with the usual results.
Lucy decides she must re-enter the workforce if she wants more spending money. Ethel stays behind to cook and clean for the Ricardo's and Lucy finds out how much has changed in the employment departments.