Department S - Season 1 Episode 17 Last Train to Redbridge

LOCATION: London DATE: November 22nd A subway arrives at its final destination for the evening. A conductor finds a car filled with dead people, and he is overcome by something in the air and dies as well before he can leave the car or notify anyone. As Annabelle is escorting the widow of one of the victims from the morgue, the widow is abducted at gunpoint. Jason further complicates matters by being abducted by the people responsible, while Stewart and Annabelle try to figure out why the massacre happened and who was behind it.