The beautiful Yolisa Warren lives quietly in the country with her father, her mother having died five years ago. Unexpectedly her uncle, Lord Langford, who is a brilliant Diplomat and who is sent all over the world on secret missions, arrives at their house. He says that he would like Yolisa to come with him to Kavalla, a small independent country in the Balkans, where he is to travel on behalf of Queen Victoria and the Prime Minister.