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Douglas Hall, a Broadway writer, and his wife Helen love each other, but their argument over Helen's desire to resume her stage career, which ended five years earlier, threatens to end their marriage.  When the scandalous, sensational French star Raquel is hired for Douglas' new show, Helen recognizes her from her photograph as Jill Williams, with whom she used to have a sister act in vaudeville.

When Helen visits Jill, now a blonde with a phony French accent, Jill suggests that Helen impersonate her during rehearsals so that producers and agents will see her talent and Douglas will be able to recognize her abilities.  While Jill goes to Atlantic City with her lover Rameau, Helen as "Raquel," flirts with the show's producer, Victor "Vicky" La Maire, who falls in love with her despite Douglas' warning about falling for an entertainer.  When Douglas, who is annoyed that Helen has disappeared, congratulates "Raquel" on her performance, his uncontrollable attraction to her leads to a passionate kiss, and they make a date for that night.

Greatly upset, but excited nevertheless, Helen faces the prospect of testing her husband's faithfulness: if he tries to make love to her, she will know that he is unfaithful; yet if he does not, she will think she has lost her appeal to him.  That night, under the pretext of talking up Vicky to Helen, Douglas falls into a passionate embrace with her on the terrace, while Vicky plays a romantic song from inside.

On opening night, Douglas suggests to Helen that they go away together the next night.  Helen decides to leave that night, but Jill is delayed in returning.  While Helen goes on as Raquel, Douglas, who confesses his misgivings to Vicky, writes her a note.  After Jill returns, her husband, a French senator, interrupts her conversation with Helen and drags Jill into a taxi.  Douglas and Vicky see them and follow, while unknown to them, Helen continues the show.

When they return and Helen reveals her real identity to Douglas, he apologizes for doubting her performing ability.  Helen calls this the "wrong" apology, and she is perturbed until she sees his note to "Raquel," which says that he still loves his wife.  While still acting coy to each other, they play together on the piano the song that Helen sang in the show, and after Douglas says that he knew she was "Raquel," she calls him a liar.