Rookie wartime MI5 "watchers" were advised they needed to be prepared to offer a big tip if they had to tell a taxi driver to "follow that cab" when pursuing a suspect, newly declassified ...

MI5 personnel are caught up in a traffic jam in London while escorting the CIA's most wanted terrorist to an arranged CIA handover point, when he is suddenly rescued by armed men on motorbikes.

One episode delves into the mystery of MI5 agent ‘Jack King’. During World War II, a network of British fascists gathered secret information that might help the Nazi cause and hasten their own ...