Investigator Lily Thomas tries to get Elliott to reveal what he knows about Philby. She uses psychological tricks to steer him in the right direction.

Philby begins to understand that the KGB can never fully trust him now that he is in Moscow, and as far as they're concerned, his life as a spy for them is over; in London, Elliot warns Anthony Blunt that his cover has been blown.

Elliott rattles Blunt's cage to make him panic and then follows him to a clandestine meeting in the middle of the night.

Elliott and Lily fear that no one can really be trusted and race to interrogate Blunt. However, Angleton thwarts their plans because he wants Blunt arrested.

Lily has forced Elliot to remember more than he perhaps ever wanted to about Philby. Months later, Elliott receives a letter from Philby asking for a meeting in an East Berlin bar.