1. The German Woman  

Foyle applies to his superintendent for permission to join the army, but has his request turned down. Meanwhile, enemy aliens are being treated very differently - the Kramers, an anti-Nazi couple, are interned and badly treated, to the point that Mrs Kramer dies; however, Greta Beaumont, a German army officer's sister married to an influential local magistrate at Lower Fenton, is exempted and remains with her husband... Then, after a German bomb hits the pub in her village, Greta is viciously decapitated and Michael Turner is suspected of the murder. But Foyle finds there is more to the Beaumont family than meets the eye, and he finds corruption in his own police force.

2. The White Feather  

It is May, 1940, and a German invasion is feared any day. Foyle investigates a girl's act of sabotage and the suspicious death of Margaret Ellis. The girl in trouble (sabotage is a hanging offence) works for the White Feather hotel, where the Friday Club - a pro-Hitler and violently anti-semitic group led by Guy Spencer - meets every Friday. Foyle is deeply shocked to find that Milner, his trusted police sergeant, is a member of the Friday Club.

3. A Lesson In Murder  

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?

4. Eagle Day  

After a bombing raid on Hastings, a man is found dead in the rubble - but from a stab wound to the heart. Foyle soon finds that the dead man was a lorry driver who had been moving valuable paintings to a place of safety in Wales. Then Foyle's son Andrew comes home on leave from a secret radar station. Andrew's friend from University is under observation from Special Branch as a suspected communist sympathiser. Andrew befriends a WAAF and finds out about her friend who killed herself. When he tries to find out more, his senior officers try to frame him for being a spy. Sam's clergyman father visits her to ask her to come home, and he offers the insight which solves the murder of the lorry driver. That then helps Foyle to crack the trumped-up charges against Andrew. It turns out that the radar station commander had been using the strict veil of secrecy surrounding the installation to exploit female staff sexually.