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.
Director: Trevor Nunn
Running time: 1h 41min
Release date: 3 May 2019 (Sweden)
Cast: Judi Dench, Sophie Cookson, Stephen Campbell Moore, Tom Hughes, Laurence Spellman, Tereza Srbova