After having been forced to leave the Soviet Union 1929 Trotsky has ended up in Mexico 1940. He is still busy with politics, promoting socialism to the world. Stalin has sent out an assassin, Frank Jacson. Jacson befriends a young communist and gets an invitation to Trotsky's house.
In German-occupied Paris, an immoral art dealer, Robert Klein, leads a life of luxury, until a copy of a Jewish newspaper brings him to the attention of the police, linking him with a mysterious doppelgänger. Will Mr. Klein clear his name?
At Oxford, Austrian student Anna von Graz (Jacqueline Sassard) is dating fellow student William (Michael York), whom she plans to marry, but she ends up involved with two unhappily married Oxford professors instead.