CS Foyle is replaced and is free at last - he's resigned his position and planning to travel to the United States for an extended tour. Before departing however, he's asked to look into the case of James Devereaux, a young man who joined the Nazi British Free Corps during the war. He was taken prisoner by the Germans and refuses to explain to anyone, including Foyle, why he agreed to join the Free Corps in the first place. In a related case, DI Paul Milner investigates the murder of Agnes Littleton who was strangled with a nylon stocking. The woman worked as a secretary for James' father, Sir Charles Devereaux. Agnes was living with the Devereaux's now retired cook, Mrs. Ramsay and from all accounts was quite happy there. She also had a friend named Jack who did something hush hush during the war. A case of mistaken identity and events from James' childhood are key to solving the mystery. Sam Stewart and her friend Adam Wainwright meanwhile have lost the support of the bank who have refused to increase Adam's overdraft. In fact they've asked him to pay what he owes forthwith. The news that developers may want to buy the property doesn't provide much solace as the proposed new development would destroy the village green, something Adam and Sam decide they will work against.

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