Invasion: As the first American GIs arrive to build an airbase near Hastings, the murder of a barmaid further strains already-tense relations between the locals and the Yanks. Bad blood: A top-secret experiment in biological warfare goes horribly wrong, complicating a murder investigation and threatening the life of Foyle's faithful driver, Sam. Bleak midwinter: The death of a young munitions worker and the murder of Paul Milner's wife seem linked,...