Bad Blood

S4, E2: Bad Blood

Available on iTunes, Acorn TV, Prime Video
S4 E2: August 1942. Helping a colleague from a nearby town probe the murder of a war hero, Foyle confronts a deeper—and potentially deadlier—mystery. A top-secret experiment in biological warfare goes horribly wrong, claiming the victim's widow and threatening the life of Foyle's driver.
Starring Ken Colley