The Lady Eve (1941) on Netflix

After one year in Amazon researching snakes, the naive ophidiologist Charles Pike returns to the United States in a transatlantic. Charles is the son of the Connecticut's brewery millionaire Mr. Pike and disputed by gold diggers. The swindlers Jean Harrington (Barbara Stanwyck), her father "Colonel" Harrington and their friend Gerald plan a confidence trick on Charles, but unexpectedly Jean falls in love with Charles and she calls off the scheme. However Charles's bodyguard Muggsy discovers that Jean is a con-artist and the disappointed Charles leaves Jean. Sometime later, in New York, the trio of con-artists meets their friend "Sir" Alfred McGlennan Keith in the horse races and they learn that "Sir" Alfred belonged to the high-society of Connecticut based on the reputation he had built. Jean sees the opportunity to take revenge at Charles, and she travels to the house of her "aunt" pretending to be the British noble Lady Eve. Mr. Pike promotes a party for Lady Eve and she seduces Charles that proposes her. But her intention is to get even with Charles.