The first in the popular Fu-Manchu mystery series introduces English sleuth Denis Nayland Smith and his companion, Dr. Petrie, to the satanic Dr. Fu-Manchu, a cunning Chinese criminal mastermind who means to rule the world. The Insidious Dr. Fu-Manchu is the first title in the famous series of Yellow Peril novels published by English writer Sax Rohmer. The novel, like its many sequels, pits the 'evil genius' of the Far East against the British Duo.