In 1945 King George VI dispatched a trusted art expert to a German castle to retrieve sensitive royal letters before American forces could find them. The mission looked like the ultimate act of loyalty, yet the same polite art historian was passing classified intelligence to the Soviet Union. This deep dive explores the astonishing double life of Anthony Blunt.

It is a study in extreme compartmentalization and how insulated elite institutions can stay blind to threats operating in plain sight.

• His Paris childhood, cold intellectualism at Marlborough, and Cambridge, where the Apostles shaped his Marxist convictions.
• His work as a talent spotter, recruiting figures like Guy Burgess and Kim Philby.
• His MI5 access to Ultra decrypts and the intelligence he passed to Soviet handlers during the war.
• His cover as  ...