Call of the South Seas (1944)

FBI Agent Kendall Gaige goes undercover on a South Seas island in order to expose the underhanded and exploitative business practices of Steve Landrau. In the course of his investigation Gaige is introduce to the Paris-educated native princess Tahia, who believes that he has arrived to save her people from poverty. A romance, of course, ensues as Gaige attempts to expose Landrau before his cover is blown.