Strange things happen in a revue theatre. The dancer Maria seems to be hunted by an invisible admirer. When the body of a probable FBI agent is found in a trunk the police asks FBI man Joe Como for help. Como gets interested in the revue theatre and an ominous transport firm soon. When he is receiving mysterious threatening letters he is sure that Dr. Mabuse has risen again. But what is going on at "Enterprise X" so that both the goverment and the mad genius in crime are interested in it?
A series of knife murders have an odd feature about them; the victims find that their luggage has been packed for them just before their deaths. Scotland Yard investigates, and discover that the murders are linked to an addictive drug called Mescadrine.
Berlin, 1936. Athletes and visitors from all over the world have come to the city to take part in the Olympic Games. Anti-Fascists use the opportunity to tell the foreign guests about the situation in Germany by distributing leaflets. Being cornered by the Gestapo, the wounded resistance fighter Jakob manages to go into hiding with the help of the Swiss doctor Thea. They fall in love with each other and when Jakob joins the International Brigades in Spain to fight against Franco, Thea follows him and becomes a dedicated fighter against Fascism. The enduring battle, however, keeps preventing them from becoming a real couple.
Albert Hauptmann is an out of work waiter in Cologne who is often confused with a former Captain of the Nazi Army. Albert uses this to his advantage and becomes the Director of the Montan Corporation, and a member of the West German Parliament. Herr Karjanke, the real Captain, learns of Albert’s ruse, and wants to claim his "rightful" position in Parliament. But Karjanke cannot come forward until his politicking "Doppelganger" succeeds in passing an amnesty law for war criminals. When Albert is finally brought before a judge on charges of fraud, he learns that this own amnesty law does not apply to him.
Shortly after the seizure of power by Adolf Hitler at the beginning of 1933, preparations were underway to silence the members of the socialist and communist parties.
