The Shadow of Tyburn Tree tells the story of Roger Brook-Prime Minister Pitt's most resourceful secret agent-who, in 1788, is sent on a secret mission to the Russia of that beautiful and licentious woman Catherine the Great. Chosen by her to become her lover, Roger is compelled to move with the utmost care, for if it was known that not only was he spying for two countries but also having an affair with the sadistic and vicious Natalia, he would meet certain death. The story moves to Denmark and the tragedy of Queen Matilda, to Sweden and the amazing ride of King Gustavus to save Gothenborg, and finally back to England where Roger returns to the arms of his one great love, Georgina.