Called out of retirement to settle the affairs of a friend, Smiley finds his old organization, the Circus, so overwhelmed by political considerations that it doesn't want to know what happened. He begins to follow up the clues of his friends past days, discovering that the clues lead to a high person in the Russian Secret service, and a secret important enough to kill for.
Madame La Pierre
Smiley interrogates a diplomat by showing him a series of photographs, and in turn, closes in on the person who killed Vladimir. He is lead to the asylum, and ironically, things eventually become clearer.