Episode 1: High CastleA university professor who had been working as a translator at the Nuremberg trials is stabbed to death. As Foyle investigates, he delves into the world of international oil politics and corrupt Nazi businessmen. Sam assists the murder inquiry by going undercover, despite her pregnancy.Episode 2: TrespassAs Britain debates the creation of a Jewish state in Palestine, the son of a wealthy Jewish businessman is assaulted. The flames of anti-Semitism have recently been fanned in London by Charles Lucas, a right-wing writer, and Foyle suspects the attack was racially motivated.Episode 3: EliseAfter an attempt on Hilda Pierce's life, Foyle scrutinizes her work for SOE during the war. Could this be related to the deaths of nine SOE agents in France and rumors of a traitor called Plato?

Episode 1 - The Eternity RingMI5 suspects British atomic research has been infiltrated, and ask Foyle to investigate whether a Russian spy network could be at work in the heart of London.Episode 2 - The CageFoyle’s investigation into the death of a nameless Russian leads to a mysterious military facility and the discovery that the victim was a spy with dangerous connections to British intelligence.Episode 3 - SunflowerProfessor Peter Van Haren gives a lecture to a group of students on the self-portraits of the artist Rembrandt and causes a young man to suffer a frightening flashback which ends in tragedy.

Dr. Brewster's suicide takes a particular twist when the pathologist determines that he had also been bound and gagged. The Brewsters, both medical doctors, ran a private clinic and their son John, who lived at home, is doctoral candidate in philosophy. One possible suspect is Michael Steppings who threatened the Brewsters and their nurse after his daughter suffered severe side-effects and is now in a vegetative state from a botched operation two years previously. The forensics lab determines that one of Steppings's threatening letters was altered and Morse learns that Brewster may at one time been having an affair, so he must consider another possible motive for murder.

Ex-cop Jack Taylor earns a reputation for being a tough-as-nails private investigator who's not afraid to take on vigilantes or track down killers.