During the Cold War, Alec Leamas, a former
SOE operative who fought in the
Netherlands and
Norway, runs a sizeable East German intelligence ring through his posting as Station Head of Berlin Station. Hans-Dieter Mundt, a former low level
Abteilung officer who murdered
Samuel Fennan a few years prior, has risen to power in the
counterintelligence section and systematically eradicates the network. Leamas attempts to save Karl Riemeck, his final undercover source and member of the
praesidium of the
Socialist Unity Party, but fails, witnessing his death as he attempts to cross into
West Germany. With his network destroyed, Leamas returns to London and visits the Circus' elusive chief,
Control, to sanction his return "from the cold" and retirement. Instead, Control requests he stay in play for one final operation; a simulated defection to East Germany to frame Mundt as a
double agent. Control explains that Mundt's deputy, Jens Fiedler, suspects his superior may be a turncoat for western intelligence services and could tip the balance in favour of ousting Mundt from power. In exchange for his success, Leamas will retain anything he makes on the mission, a pension pot, and will receive official sanction to retire from the Service. In order to attract the attention of East German intelligence, Control organises Leamas' demotion to the finance department. Leamas begins to show signs of
alcoholism and is eventually dismissed for
fraudulent activity with Circus accounts. Leamas is forced onto the
dole, lives in a substandard flat, and eventually starts working in a run-down library around local
CPGB secretary Liz Gold. Leamas and Gold gradually strike up a friendship and eventually become lovers. After a period of illness reveals the extent of Liz's feelings for him, Leamas confesses he will soon be forced to say goodbye and she must not look for him. A few days later, he says goodbye, and takes the "final plunge" into Control's plan, getting arrested for assault and sentenced to three months in prison. Before fully involving himself in the scheme, however, he forces Control to promise to keep Liz out of the Circus' plans. Following his release, Leamas is approached by a recruiter who claims to know him from Berlin. He lets Leamas stay at his home, before introducing him to a contact who takes Leamas to the Netherlands on a
forged passport. There, an Abteilung agent interrogates Leamas at a safe house before smuggling him into East Germany. Leamas is gradually exposed to more senior officials within the Abteilung, during which he drops hints about ongoing payments to a double agent. In Britain, Liz is suddenly visited by a-now-retired George Smiley, who tells her to come to him should she need anything, inquires about her relationship with Leamas, and pays off the outstanding rent on Leamas' flat. After rigorous interrogations, Leamas is moved to an isolated property and held under guard, where he is finally introduced to Jens Fiedler. His days consist largely of extended interviewing about his previous Circus work while hiking alongside Fiedler or a guard. In their time together, both men end up regularly debating the philosophical distinctions between Leamas'
pragmatism and Fiedler's
idealism of life in the DDR. Through these debates, Leamas interprets Fiedler to be inherently concerned about the righteousness of his actions and their impacts on the country. In contrast, Mundt is portrayed by Fiedler as an opportunistic mercenary who abandoned the
Nazis and 'became' a Communist out of self-preservation. As the pair get closer, Fiedler also conveys his fears about Mundt's long standing
anti-semitism affecting him, a Jewish man. Near the end of Fiedler's interrogations, the power struggle in the Abteilung escalates when Mundt abruptly arrests Fiedler and Leamas. In the panic Leamas inadvertently kills an East German guard, and awakes in Mundt's facility, where Mundt interrogates and tortures both men. It is then revealed, however, that Fiedler had also submitted an arrest warrant for Mundt, leading the East German régime to intervene and convene a court. Fiedler and Mundt are both released, and then summoned to present their cases to a tribunal convened
in camera. During the trial, Leamas further elaborates on previous mentions of undercover payments to a foreign agent in bank accounts which match locations that Mundt had travelled to, while Fiedler presents other evidence implicating Mundt to be a British agent. While Leamas is away, Liz receives an invitation from the East Germans to participate in an exchange of party members with the British Communist Party. Surprisingly, she is summoned by Mundt's attorney as a witness and forced to testify at the tribunal. She then admits Smiley paid the apartment lease, and that Smiley offered help should she need it. She also confesses that Leamas made her promise not to look for him, and that he said goodbye immediately before he assaulted the grocer. Leamas, realising his cover has been blown, offers to tell them about the mission in exchange for Liz's freedom, but realises the true nature of the scheme during the course of the tribunal. Fiedler is then arrested at the tribunal's end. Immediately after the trial, Mundt locates and then releases Leamas and Liz from jail, and gives them a car to get from their current location to the Berlin Wall. During the drive, Leamas explains the entire situation to a bemused Liz. Mundt is actually a British double agent, who reports to Smiley, who is actually undercover in the mission and pretending to be retired. Mundt was turned against the East Germans before he returned following the murder of Samuel Fennan a few years earlier, and the mission's true target was Fiedler, who was closing on exposing Mundt as a double agent. On account of Leamas’ and Liz's intimate relationship, however, Mundt (and Smiley) were provided with the means of discrediting Leamas' ability to provide evidence to the tribunal, and as such discredit Fiedler. Liz, however, is shaken, and realises that her actions have enabled the Circus to protect their asset Mundt at the expense of the thoughtful and idealistic Fiedler. When asked what will become of Fiedler, Leamas replies that he will be shot. Although disgusted, Liz overcomes this on account of her love for Leamas. The two drive to the Berlin Wall, and make a break for West Germany by ascending the wall and through a section of sabotaged barbed wire atop the wall. Leamas reaches the top, but as he reaches down to help Liz, she is shot and killed by one of Mundt's operatives. She falls back down, and as Smiley calls to Leamas from the other side of the wall, he hesitates, before eventually descending the wall on the East German side, where he is also shot and killed. ==Characters==