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Read the complete plot breakdown of Madame Sin (1972), including all key story events, major twists, and the ending explained in detail. Discover what really happened—and what it all means.
Ex-CIA agent Anthony Lawrence Robert Wagner is abducted from London and brought to the Scottish Highlands on the orders of Madame Sin Bette Davis, an international criminal who runs her own organization. From her base, she operates a “Thought Factory” where scientists have developed advanced technology, including sonic weapons and a device that can implant thoughts into a subject’s brain. She demonstrates the thought implantation process on her assistant Nikko, who is able to play a Mozart piece after having it implanted in seconds.
Madame Sin persuades Lawrence that his partner Barbara Catherine Schell, also an intelligence agent, was sent to her death on the orders of his former superior, Connors Paul Maxwell. She shows him secretly filmed footage of Barbara being tortured by Chinese agents as proof. She uses this as leverage to get Lawrence to cooperate with her plan to steal a new Polaris nuclear submarine which is due to be tested in nearby waters and sell it to foreign radicals.
Lawrence plays along with Madame Sin’s plan, which involves abducting his old friend Cavendish Gordon Jackson, a Royal Navy officer in charge of the submarine test, and implanting the idea to steal the submarine into his brain. Lawrence discovers that the film of Barbara’s torture was fake when he recognises a scar on the hand of one of Madame Sin’s henchmen. Barbara then appears alive and well and is held hostage while Lawrence returns Cavendish to the naval base to carry out the rest of the plan.
Lawrence tries to escape and is rendered deaf when the sonic weapon is used on him. He manages to penetrate the naval base and raise the alarm. Lawrence’s old boss Connors has Cavendish put under arrest and thwarts the plan to steal the submarine. Later in Spain, Lawrence and Barbara are celebrating when Barbara reveals that she is working for Madame Sin and has poisoned his drink. Ordered to wait until he is dead, she watches him die then departs with one of Madame Sin’s henchmen.
Last Updated: October 09, 2025 at 09:34
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