The Last of Mrs. Cheyney

At an elegant gathering of English nobility, young widow Fay Cheyney wins (the favor of all) with her beauty, musicality and clever repartee. Cheyney, however, is not who she claims to be. She's part of a cadre of con artists who intend to steal a valuable necklace owned by one of the bluebloods. But the heist may go awry when witty, handsome Lord Arthur Dilling, the nephew of the targeted victim, steals the light-fingered femme's heart. (official distributor synopsis)