The part about the naïve young woman coming to New York looking for love and success is believable. The part where she finds success is believable. The part where 'Sam' dumps 'Kate' is believable. The part where 'Sam' decides he's in love with 'Sheila' is unbelievable. It's not because the actress Berlin is rather plain - it's unbelievable because 'Sheila's' personality is so obnoxious, what's to love?