Ring of Spies

Robert Tronson directs this 1960s British drama based on the scandal of the 'Portland Spy Ring'. Bernard Lee stars as Henry Houghton, an alcoholic and embittered Navy clerk who is targeted as a weak point by Soviet agents Helen and Peter Kroger (Nancy Nevinson and David Kossoff). With Houghton posted to a secret Portland lab that specialises in submarine warfare, he is able to provide the Krogers with valuable documents in return for money.

However, when the authorities are alerted to the situation, they quickly come up with a plan to catch the spies...