The film is based on Ian Fleming's 1954 novel of the same name. The storyline involves a Harlem drug lord known as Mr. Big who plans to distribute two tons of heroin for free to put rival drug barons out of business and then become a monopoly supplier. Mr. Big is revealed to be the alter ego of Dr. Kananga, a corrupt Caribbean dictator, who rules San Monique, a fictional island where opium poppies are secretly farmed. Bond is investigating the deaths of three British agents, leading him to Kananga, and he is soon trapped in a world of gangsters and voodoo as he fights to put a stop to the drug baron's scheme.