Season guide

Foyle's War: Series 4

2 episodes Premiered Jan 15, 2006 Updated Sep 27, 2026

Previously on Foyle's War

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

⚡ Directly follows the overarching narrative developments of Foyle's War Season 3.
⚡ Faction dynamics and core character alliances shift under escalating external stakes.
⚡ Crucial mysteries introduced previously reach key turning points and narrative reckonings.
⚡ Sets up serialized story arcs that build directly toward the climactic season finale.

Season 4 Episodes

Episode Guide

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Season 4 Progress Shield

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Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

100%

Mytharc (2): Crucial lore & season climaxes

Core (0): Character development & subplots

Side Quest (0): Standalone / filler

S4·E1 Mytharc

Invasion

Jan 15, 2006 · 94 min

April 1942. Cultures clash as the first Americans arrive to build an airfield near Hastings. Some locals see the "invaders" as a threat. Others find the chance for romance among th

S4·E2 Mytharc

Bad Blood

Jan 22, 2006 · 94 min

August 1942. Helping a colleague from a nearby town probe the murder of a war hero, Foyle confronts a deeper - and potentially deadlier - mystery. A top-secret experiment in biolog