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Ricky (Desi Arnaz) is staging a French-themed musical revue at the Tropicana club. Hoping to appear in the revue, Lucy (Lucille Ball) and Ethel (Vivian Vance) hire waiter Robert DuBois (Alberto Morin) to give them French language lessons -- and in exchange, DuBois will be allowed to sing "Louise" at Ricky's club. While Ricky is delighted to include DuBois in the act, he expressly forbids Lucy to participate in the revue -- which of course means that not only will Lucy show up at the Tropicana, but she will also steal the show.