Zina, the daughter of Leon Trotsky by his first wife, is undergoing freudian analysis in Berlin in the 'thirties. Meanwhile Trotsky is in exile in Prinkipo having been driven from power by Stalin. The Nazis rise to power in Germany and Austria and Zina commits suicide.

On a trip to Paris Sally meets Pablo, a tango dancer. He starts teaching her to dance then she returns to London to work on some "projects". She visits Buenos Aires and learns more from Pablo's friends. Sally and Pablo meet again but this time their relationship changes, she realises they want different things from each other. On a trip to Buenos Aires they cement their friendship.

A mysterious woman recruits a Cabinet doorman and an ex-civil servant for a plot to bring down the British government.