The Last Train to Redbridge Department S : Season 2 Episode 12

A tube train arrives at Redbridge station with all its passengers dead and the conductor who found it is also knocked out by nerve gas. Whilst Annabelle is escorting Mrs. Taylor, the widow of one of the dead men, from the morgue, they are held up and Mrs. Taylor is abducted, as later is Jason, whilst investigating at the station. The trail leads to a manufacturing company where Annabelle goes undercover as a secretary though she too is in danger when her employers, criminal speculators out to tap the hotline between the White House and 10 Downing Street, discover who she is.