After Police Captain Dan McLaren becomes police commissioner, former detective Johnny Blake publicly punches him, convincing rackets boss Al Kruger that Blake is sincere in his effort to join the mob. "Bugs" Fenner, meanwhile, is certain that Blake is a police agent.
Harry and Inez are a dance team at the Wonder Bar. Inez loves Harry, but he is in love with Liane, the wife of a wealthy business man. Al Wonder and the conductor/singer Tommy are in love with Inez. When Inez finds out that Harry wants to leave Paris and is going to the USA with Liane, she kills him.
When the Manhattan investment firm of Sherwood Nash goes broke, he joins forces with his partner Snap and fashion designer Lynn Mason to provide discount shops with cheap copies of Paris couture dresses.
