"The Insidious Dr. Fu Manchu" is a novel written by Sax Rohmer and first published in 1913. It introduces the character of Dr. Fu Manchu, a brilliant and malevolent Chinese criminal mastermind. The story follows Nayland Smith, a British agent, as he attempts to thwart Fu Manchu's nefarious plans, which often involve elaborate schemes and dangerous inventions. The novel is notable for its portrayal of Orientalism and has been both criticized and celebrated for its depiction of Asian characters. It is part of a series featuring Fu Manchu, who became an iconic figure in popular culture, influencing various adaptations in film, television, and literature.