Follow the defection of notorious British intelligence officer and KGB double agent, Kim Philby, through the lens of his complex relationship with MI6 colleague and close friend, Nicholas Elliott.

Guy Pearceas Kim Philby
Damian Lewisas Nicholas Elliott
Anna Maxwell Martinas Lily Thomas
Stephen Kunkenas James Jesus Angelton
Adrian Edmondsonas Sir Roger Hollis
Nicholas Roweas Sir Anthony Blunt
Monika Gossmannas Galina
Roger Barclayas John Profumo
Lucy Russellas Jane Sissmore
Dustin O'Halloran