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.

The apparently accidental death of a young woman in a munitions factory becomes linked with the murder of Milner's estranged wife as he falls under suspicion.

Foyle has his hands full dealing with illegal gambling, sabotage, and his needy goddaughter who shows up on his doorstep with her traumatized son.