oyle is asked to protect Karl Strasser, a former Nazi officer masquerading as a Dutch citizen and now working with MI5 to catch Russian spies. Strasser believes he is being followed and that he is in danger. American colonel Jackson wants Strasser in connection with a war-time atrocity known as Operation Sunflower in which the German's patrol shot unarmed allied servicemen. The sole survivor, Tommy Nelson, recognizes Strasser and follows him but when Strasser is killed by a car bomb Foyle finds no shortage of other suspects, including the landlady and fellow tenants at his lodgings, who knew who he was as well as Tommy and the Americans. Meanwhile Adam gets involved with a farmer battling the government to return his land and accusing a cabinet minister of conspiracy. His use of Sam to look into the matter leads him to learn a bitter political lesson but at least she has good news for him.

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