Scotland Yard inspector Benson (played by future "James Bond" Roger Moore) seems determined to monitor every movement made by Lady Gwendolyn Avon (Hazel Court). Benson informs his superiors that he is convinced that Lady Gwendolyn plans to smuggle a valuable emerald necklace out of the country, and then sell it so she won't have to pay the taxes on it. The story takes an unexpected turn when the necklace is stolen by a "person or persons unknown." ~ Hal Erickson, Rovi