In a vibrant city of the 1920s, a young dreamer named Mary works as a secretary at a rising advertising agency. Caught between the monotony of everyday life and her yearning for something more, her life takes an unexpected turn when she meets a charismatic ad man, Bob, who has a revolutionary vision for the future of marketing. The attraction between them is instant, but Mary soon discovers that Bob is a carefree dandy who is only looking for fun, while she is in search of something more serious.