The Shadow of Tyburn Tree: Dennis WheatleyRoger Brook adventure No. II. Nov 1787 Apr 1789 Roger Brook Prime Minister Pitt's most resourceful secret agent is sent on a secret mission to the Russia of that beautiful and licentious 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 most certainly die. The