'London Spy' is the story of a chance romance between two people from very different worlds, one from the headquarters of the Secret Intelligence Service, the other from a world of clubbing and youthful excess. Danny (Ben Whishaw) - gregarious, hedonistic, romantic and adrift, falls for the anti-social enigmatic and brilliant Alex (Edward Holcroft). Just as the two of them realize that they're perfect for each other, Alex disappears. Danny, utterly ill-equipped to take on the complex and codified world of British espionage, must decide whether he's prepared to fight for the truth.