After an unremarkable interview, Circus agent George Smiley determines the subject of a standard security check-a civil servant in the Foreign Office named Samuel Fennan-poses no threat, nor presents any reason for suspicion of espionage. Hours later, Samuel Fennan is found dead by suicide. Suddenly finding himself under intense scrutiny, Smiley realizes the Circus intends to blame him for Fennan's death. Rather than remain idle, Smiley begins his...