The lovely Katie Armstrong, a cunning thief and fraudster, is blackmailed into spying on the American patriot John Smith, who is fighting against British rule. The case allows her to find out that behind this name is the English aristocrat Ethan Harding. Katie is delighted! She will receive the promised attack! But something stops her; she cannot give Ethan away, and soon falls in love with him. But the life of a spy is full of dangers. And now Katie is faced with a choice - to save herself or a loved one from the gallows.