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Foyle is assigned to protect an eminent art historian, a former Nazi who is now an important MI5 asset. Sam has some big news for Adam.
Foyle returns from the U.S. and is soon approached by MI5, who want to recruit him to investigate a Soviet spy ring operating at the heart of the Establishment. Sam's husband has parliamentary ambitions.
Foyle investigates the death of several high-ranking defectors from the U.S.S.R., and uncovers a mole working at an MI5 interrogation centre. Sam tries to help her husband with his by-election campaign.
June, 1940. A conscientious objector dies in a police cell after being refused exemption from military service by Judge Lawrence Gascoigne, and after being beaten up by the police. Then a young boy evacuated from London and billeted on Judge Gascoigne's household dies in an explosion in the garden office where Gascoigne works, leading the police to suspect a revenge attack on the Judge. It also appears that Gascoigne strongly disapproves of his daughter's lover - he works at a mysterious "munitions factory" near the Judge's house, which turns out to be making coffins. Other suspects are the girlfriend and best friend of the conscientious objector who died... Getting nowhere, Foyle asks himself a startling question - what if the small boy killed by the bomb was actually the intended victim, and not the judge at all?moreless
When a truck loaded with barrels of petrol crashes, Foyle suspects the existence of an illegal fuel racket. Sam persuades Foyle to let her go undercover at the local fuel depot to investigate. When one of the suspects is found murdered, suspicion falls on Andrew Foyle, who was the last person to see her alive.moreless