The German wife of a rich and influential aristocrat exempted from wartime internment is found decapitated in the midst of anti-German feeling.

With the English army trapped in France and a German invasion imminent, a Nazi sympathizer is murdered during a pro-Facist meeting at a country hotel.

Foyle investigates the suicide of a pacifist and death threats to the judge who ruled against his conscientious objector status.

Foyle investigates a man found with a knife in his stomach in a bombed out building while son Andrew gets involved in a top secret radar program.

After Foyle is a guest at a friend's home at a dinner for an important American diplomat, a suicide victim and German agent both are discovered near the house.

Sam volunteers to go undercover to discover how rationed gasoline is being stolen from a fuel depot, and Andrew becomes a suspect in a murder case.

When a British food corporation signs a secret agreement with the Nazis to provide essential food services to the enemy during wartime, murders result.

Foyle's investigation of the death of a young black marketeer and stolen food is interrupted by his suspension on charges of sedition.

February 1941: Foyle again pursues a position that would allow him to contribute more to the war effort. But a local murder investigation sidetracks this endeavor as Foyle finds himself caught between rival spy organizations.

February 1941: When a local manor house is commandeered for use as a special burn unit for treating injured RAF pilots, Foyle is called in to investigate a series of strange accidents.

April 1941: Foyle questions three Land Army girls about a murder that occurs on a Hastings farm.

A.C. Rose orders Foyle to delegate his investigation of black marketing ring and personally look into the possibly seditious acts of a Socialist activist.

American troops arrive in Britain and the Corps of Engineers building an airstrip on a Hastings farm is met with resentment.

August 1942. Foyle investigates the a mysterious disease affecting local farm animals and looks into the arrest of a pacifist accused of stabbing a war hero.