16 July, 1945. A military convoy arrives in the New Mexico desert carrying Professor Michael Fraser, a British nuclear scientist, and his wife, Helen Fraser. Another scientist, Max Hoffman, is waiting for them, and he takes them into a bunker where they watch the explosion of the first nuclear bomb together.One year later, a cypher clerk, Aleksei Gorin, steals secrets from the Soviet Embassy in London. He is chased by NKVD agents but manages to escape.

Foyle's investigation into the death of a nameless Russian leads to a mysterious military facility run by a respected Colonel with an impeccable war record.But as Foyle makes enquiries, he realizes the dead Russian was a spy with dangerous connections to British intelligence. Sam does her best to help husband, Adam, during his by-election campaign, but can't help putting her foot in it...

In this final episode, Foyle is drawn into the bizarre murder of an ex-Nazi defector and leading expert on Soviet intelligence who had been working for MI5. Meanwhile Sam's husband, Adam, is so pre-occupied with his new political job, she worries whether she'll be able to share some big news with him...

Learn the origins of Foyle's War, go on the set, and more.

The people who are the past, present, and future of Foyle's War.

Getting the period look just right, hosted by Honeysuckle Weeks

A look at the historical facts and visual fictions of this WWII tragedy.