A classic Hitchcock chiller based on the novel by Joseph Conrad. In Thirties London, unbeknown to his wife Sylvia (Sylvia Sidney), cinema manager Karl Verloc (Oscar Homolka) is acting as a paid saboteur. After Karl's cutting off of London's electricity supply fails to create the havoc his employers hoped for, Karl is charged with delivering a bomb to Piccadilly Circus. However, the police are already on his trail.

Cast:
Sylvia Sidney, Oskar Homolka, Desmond Tester, John Loder