arch 1943: Foyle receives a visit from his goddaughter, whom he has not seen for 10 years, and her young son who is shell shocked from when his school was bombed. When she runs off leaving her son, Foyle must locate her. A new Assistant Commissioner is after Foyle to crack down on illegal gambling. Sgt. Milner is assigned to the case and goes undercover with mixed results. Milner sees two young lads gambling lots of cash and decides to find out where they're getting their money. Foyle is also investigating a group of saboteurs. When a murders occurs near a military research facility, Foyle believes he has solved the crime but the new AC insists he release the subject in question. Foyle in turn feels he has only one option open to him.

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