Find out more about the people involved on both sides of the Iron Curtain...
Eccentric and enthusiastic, with an IQ like a phone number and egg stains on his tie.
Arkady lived a quiet life as a Russian professor at Reading University -the perfect cover!
Bobby is the arrogant, louche and ambitious Head of K Branch (counter-espionage).
Daddy is the mastermind that holds MI5 together. No one knows his real name.
Special Branch police liaison officer assisting the committee with their new investigation
Joe is an expert in undercover work who will go to any length to gather the intel he needs
The man known only as ‘Odin’ is a skilled assassin and KGB operative.
Wry, sardonic and very bright, chances are Sarah will be the first female director of MI5.
Wendy has been a secretary at MI5 for years but progression for women is still a battle.
Recruited by Joe as an agent, Yulia was a low level spy in the Russian embassy.