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1. Bölüm Foyle is now working in a different new role working for British Secret Intelligence. As the iron curtain falls across Europe, MI5 believe that British atomic research has been infiltrated, and ask Foyle to investigate whether a Russian spy network could be at work in London.
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2. Bölüm Foyle investigates the death of a Russian and it ends up leading to a mysterious military facility run by a Colonel with an impeccable war record.
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3. Bölüm Foyle finds himself being drawn into the strange murder of an ex-Nazi defector and leading expert on Soviet intelligence who had been working for MI5. Sam’s husband, Adam, is pre-occupied with his new political jobleaving her concerned that she’ll be able to share some huge news with him.