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Lord Trevor and his ward, Nan Tremain are prominent figures in London society, as well as clandestine agents of the government. With the help of wealthy East Indian, Abdul, who posed as Trevor’s body servant, Nan dressed as a foreign noblewoman, recovers the plans of certain coast fortifications which had fallen into the hands of double agent, Col. Pfaff and would have been of irredeemable loss to her country had they reached another country.