After Stalin exiles Trotsky to Mexico in 1940, he sends assassin Frank Jacson to infiltrate Trotsky's circle and assassinate him, posing as a young communist to gain access to Trotsky's home.
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.