L'Énigmatique Monsieur Parkes plot
Lucy Stavin, living in Paris as the reluctant tool of international jewel thief Malatroff, becomes interested in Parkes, a mysterious Englishman who is her neighbor, but all sorts of circumstances prevent a meeting. She is expected to steal the pearl necklace from Sylvester Corbett, a nouveau riche American. She poses as a countess and goes to Nice, where she discovers that Parkes has the house next door to Corbett and his family. When Lucy is finally forced to carry out the theft, she comes face to face with Parkes and discovers that he is also a true gentleman thief...