London, a cosmopolitan metropolis of 8 million inhabitants and home to the world renowned British Secret Service, who’s sole purpose is to defend and protect the security and interests of the United Kingdom. For decades cunning games of espionage have been played out on the cities streets, assassinations, treason and betrayal.

This film sets about entering the high stakes world of spying and we learn about whats really happening in the shadows, exploring the highest echelons of MI6, to field operatives who risked their lives, unsung hero’s of Britain’s secret code breaking station and the KGB double agents who fought the Cold War.