Master criminal Fantomas kills an ambassador, has an affair with the dead man's wife, sneaks into a rich woman's house handing out vanishing-ink business cards, is arrested and sentenced to death but switches with an actor, who goes to the guillotine.
Georges Lancier is a former mercenary for hire. After he retires from business, he gets trapped in a complex conspiracy involving a diamond heist, international financiers, and struggle for political power in an imaginary African country.