George Smiley discovers the mole using a piece of information that polygraph interrogations were being conducted by the KGB, which leads him to Haydon.
Gauthier's offer to Serge to perform in Molière's play 'The Misanthrope' serves as a catalyst for a deep reflection on both of their lives and careers.
Rottmayer is revealed to be Victor Mannheim, a mysterious financial mastermind that the CIA wants, and the escape was orchestrated to extract him from the prison.
Warden Hobbes is revealed to be corrupt and is using 'The Tomb' for illegal blacksite activities, keeping Breslin imprisoned to prevent anyone from escaping.