Season pulse
Episodes
3 episodes
The Eternity Ring
Fresh from a stay in America, Foyle encounters MI5 agents Hilda Pierce and Arthur Valentine, who draw him into the hunt for a suspected Russian spy ring. As part of his investigation, Foyle reconnects with Sam, now working for a nuclear scientist and married to political candidate Adam Wainwright.
The Cage
Looking into the deaths of several high-ranking Russian defectors, Foyle finds ties to the apparent suicide of an unidentified Russian man and the disappearance of a young woman. His search leads him to a government listening station that may not be what it appears.
Sunflower
When an MI5 intelligence asset fears for his life, Foyle must protect the ex-Nazi from assassination attempts - and American authorities. Meanwhile, a new MP Adam tries to help a farmer reclaim his land and uncovers information that could threaten his career.