Lucy Stavrin, living in Paris as the unwilling tool of international jewel thief Malatroff, becomes interested in Parkes, a mysterious Englishman who is her neighbor, but circumstances prevent their meeting. She is assigned to steal a pearl necklace from Sylvester Corbett, a nouveau riche American, and posing as a countess, she goes to Nice, where she discovers that Parkes has taken the house next to that of Corbett and his family. A romance develops but is complicated when Corbett’s daughter becomes infatuated with Parkes. When Lucy is finally forced to carry out the theft, she comes face to face with Parkes, discovers him to be an accomplished gentleman crook, and therefore tells him about her predicament with Malatroff. Their mutual love is strengthened, and they decide to go straight; Malatroff interrupts their plans, but he is killed as Parkes rescues Lucy from his grasp. More on Wikipedia or Mubi
Watch Slightly Scarlet (1930)
