S4.E1 ∙ Invasion Sat, Jan 14, 2006 American troops arrive in Britain and the Corps of Engineers building an airstrip on a Hastings farm is met with resentment. 8 /10
S4.E2 ∙ Bad Blood Sat, Jan 21, 2006 Foyle investigates a mysterious disease affecting local farm animals and looks into the stabbing of a war hero. 8.4 /10
S4.E3 ∙ Bleak Midwinter Sat, Feb 10, 2007 The death of a woman in a munitions factory becomes linked with the murder of Milner's estranged wife as he falls under suspicion and Foyle strives to clear his name. 8.2 /10
S4.E4 ∙ Casualties of War Sat, Apr 14, 2007 Foyle has his hands full dealing with illegal gambling, sabotage, and his needy goddaughter who shows up on his doorstep with her traumatized son. 8.1 /10