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Paul Beliot, a Communist organizer working as a waiter in Paris, shoots a coffee cup from the hand of fat capitalist Maurice Duval because the banker's lifted pinky finger annoys him.  Disguised as a policeman in order to elude the authorities, Paul takes refuge in the apartment of Marianne Duval, the banker's estranged wife.

Intrigued by the fugitive, Marianne hides him in her apartment, but with a round the clock guard surrounding the building, he becomes trapped.  This causes problems when Duval visits his estranged wife and newspaper publisher Andre Dorlay comes to court her.  As Marianne juggles three men, Paul tries to convert her maid, Doreta, and denounces capitalism and preaches revolution until he becomes accustomed to living in luxury and is enchanted by Marianne's beauty.

Gradually, Paul comes to realize that he has fallen in love with Marianne.  Their romance is endangered when Paul is summoned to the Communist headquarters and ordered to surrender himself under circumstances that would place the blame on Marianne.  After refusing, Paul returns to Marianne's apartment, where he is discovered by Dorlay and Duval, who turn him over to the police.  To get Duval to drop charges against Paul, Marianne agrees to return to her husband and Paul is released.

The next morning, as Marianne and her husband sit down at the breakfast table, Duval crooks his finger in an annoying arc, and Marianne, irked, shoots the cup from his hand.  She then flees to Paul's garret, where the two prepare to set sail for America.