English born Joan Stanley, a Soviet and communist party sympathizer, becomes employed as a British government civil servant, and gets recruited by the KGB in the mid 1930s. She successfully transfers nuclear bomb secrets to the Soviet Union (Russia), which enables them to keep up with the west in the development of atomic weapons, and remains undetected as a spy for over a half a century.
Kim Allen....University Graduate / Activist
Stephen Boxer....Peter Kierl
Stephen Campbell Moore....Max
Sophie Cookson....Young Joan
Judi Dench....Joan Stanley
Hasan Dixon....Police Officer
Kevin Fuller....Detective Philips
Freddie Gaminara....William Mitchell
Steven Hillman....Prison Guard
Phill Langhorne....Uniformed Officer
Simon Ludders....Ship's Captain
Filmography links and data courtesy of The Internet Movie Database.