Bachelor composer Charles Gerard (Tone) lives a sybarite's life in his Manhattan penthouse, which is run by his butler Martin Murphy (O'Brien). When Murphy's stepsister Ann Carter (Durbin) arrives unexpectedly, she's delighted to hear who Murphy works for because she's a singer and wants an audition--an absolute taboo in Gerard's household. So she fools him into thinking she's the new maid until she can get her big break. Nothing new but Durbin does get to work her pretty pipes.