Leamas’s defection is the central deception of the operation against Mundt: he appears to abandon British Intelligence and carry valuable knowledge into East Germany, but the betrayal has been staged to make the opposing service expose its own assumptions and, ultimately, its suspected British agent. The plan converts Leamas’s credibility into evidence. Its cost is that he must submit to an actual crossing, interrogation, and imprisonment, while the people investigating him mistake a carefully constructed pattern for proof of their own making.

Causes and Design

The operation grows out of the destruction of the Berlin network. After Karl Riemeck is lost, Leamas later explains, the service has lost its only decent agent in the Zone; other agents have already been taken, and Mundt seems to identify new recruits almost as soon as they are recruited. Control and Leamas therefore devise a test rather than a conventional investigation: let the opposing service pursue a supposed defector and see whether its own response reveals the hidden connection. Leamas later gives Control’s formulation as “Set a man to trap himself,” while Smiley calls the backwards reconstruction of how an agent would be paid and how the files would appear “Inductive.”

The supposed defector’s decline is part of the evidence being planted. Leamas describes drink, money troubles, and rumours that he has robbed the till as elements of a performance designed to look coherent from the outside. Elsie in Accounts and others help spread the gossip. He chooses a Saturday morning, when many people are about, for his breakout; the escape makes the local press and, he thinks, even the Worker. The details make the deception legible as a fall from professional standing, not merely as a claim of allegiance. In the larger design, the adversary is invited to assemble those details into a story of betrayal.

The political setting gives the performance its danger. The Berlin Wall, which the novel’s retrospective account describes as both theatre and a symbol of ideological monstrosity, divides a city and makes crossing an act of exposure. At Checkpoint Charlie, American and Soviet Bloc tanks had once faced each other across a hundred-yard strip, while the Wall’s construction forced intelligence networks to become more clandestine and perilous. In the novel’s immediate action, the Eastern border is reinforced with dragons’ teeth, observation towers, and double aprons of barbed wire. The defection is therefore staged inside a real and heavily guarded division, not a harmless theatrical boundary.

Crossing and Transfer

At first, Leamas believes he still has a choice. During the drive with Peters, he calculates that he could strike Peters in the throat, escape the car, and run for help in Berlin. He does nothing. His passivity marks the point at which the plan becomes more than a story he is telling others: he accepts the route laid out for him, despite recognizing an opportunity to break it off.

The crossing itself is disconcertingly easy. The cars dawdle for about ten minutes, apparently waiting for a prearranged time. A DKW roars past the Mercedes and stops at the West German police hut; when the barrier rises, both vehicles pass through together. Leamas notices the Eastern fortifications during the fifty yards between the checkpoints. At the second checkpoint, the booms are already raised and the East German guards watch through binoculars as the Mercedes drives straight through. The DKW disappears, then reappears behind them ten minutes later. Instead of stopping in East Berlin, the cars continue east. The smooth passage contrasts with the armed border’s visible defenses: the operation has secured a route, but the crossing still carries Leamas into the territory where his status will be decided by others.

The handover exposes another layer of the arrangement. Fiedler tells Leamas that he has reached the end of the road and will go no farther east, contrary to what Peters had led him to expect. Peters admits that he acted as intermediary. Fiedler explains that the initial interrogation took place in the West because an embassy could provide the necessary communications, facilities, and immunities; the German Democratic Republic had no embassies in the West. The Soviet Embassy at The Hague supplied those facilities. What Leamas had taken for a straightforward approach by one service was thus routed through a different state’s embassy, a practical workaround that also deepens his sense of having been handled.

Interrogation and the Manufactured Evidence

Leamas’s apparent betrayal produces information, but not the decisive secret his questioners expect. Peters interrupts when he hears that intelligence came from Riemeck, doubting that Riemeck could have obtained so much alone and speculating that he must have had help. Later, Leamas recognizes that both Peters and Control had asked about Riemeck’s access. Their shared insistence suggests that the materials may have depended on a high-level collaborator whom Control wanted to protect from Mundt. The suspicion makes the operation’s underlying question more precise: not simply what information Leamas can disclose, but who enabled the earlier disclosures and who is now trying to identify that person.

Fiedler eventually says that Leamas has given them only one piece of intelligence, and that they already knew about Riemeck. The account of the Berlin organization is accurate but old, useful as background and collateral rather than worth the fifteen thousand pounds associated with the deal. Fiedler insists that the operation is not finished because Leamas has not told him what he knows about Rolling Stone. Leamas answers by describing the limits of such clues: indications may suggest a spy in a department or at a certain level, but they do not identify a person or justify arresting an entire service. Even an indication that a spy exists does not establish which country he serves. The interrogation is therefore an argument about inference as much as disclosure: each side is testing what a pattern can prove.

That contest gives the planted financial trail its force. Fiedler presents the Copenhagen deposit as a link between Leamas and Mundt. A bank reply states that the co-signatory withdrew the money one week after Leamas deposited it; the withdrawal coincides with Mundt’s visit to Denmark under an alias, where he met an American agent at a world scientists’ conference. At the Tribunal, Fiedler specifies the sum as ten thousand dollars, the account name as Robert Lang, and the dates as June 15 for the deposit and June 21 for Mundt’s visit. He also connects Leamas’s later Helsinki deposit, around September 24, with Mundt’s clandestine journey to Finland on October 3. In this presentation, dates, aliases, bank letters, and travel converge into a case that looks circumstantial but deliberate.

The force of the evidence depends on its construction. During the Tribunal, Fiedler revisits the security rules governing the file, the letters to the Copenhagen and Helsinki banks, and the single reply Leamas received. The Helsinki bank supplied no reply, leaving the Copenhagen document unusually prominent. Fiedler presents the paper trail as an accumulating set of correspondences; for Leamas, the crucial fact is that the pattern has been made to resemble the trace of a paid agent. The operation succeeds in making the opposing investigators reason from the clues, but that reasoning does not by itself guarantee that they will reach the truth safely or interpret the evidence correctly.

Reversal and Significance

The apparent defection also entangles people who are not part of Leamas’s performance. Liz, a Communist Party branch secretary, reflects on how party life turns aspiration into routine and sometimes dishonesty: members buy copies of the Daily Worker themselves to inflate sales, then celebrate the totals as evidence of political commitment. Her doubts about a nomination connected with Ashe sit alongside the operation’s larger use of institutional appearances. Her political identity and personal connection to Leamas make her vulnerable to the consequences of a scheme whose participants control what others are allowed to know.

At the Tribunal, Leamas finally explains the staged operation. He says that after Riemeck’s loss, Control and the others worked backwards from the hypothesis that Mundt was their agent, asking how payment and records would appear. Peter Guillam recalled an earlier attempt by an Arab to sell a breakdown of the Abteilung that the British had rejected, only to discover later that the rejection had been a mistake. The plan repurposed that history, making it look as though the service had refused the material because it already knew it. Leamas recounts how the staged collapse, the rumours, and his public breakout were arranged to encourage the East German service to pursue him and construct its own case.

The staged story is not a safe mechanism for controlling the truth. When the Tribunal’s presiding voice says that Leamas is already under arrest and that the people’s prosecutor, in collaboration with Mundt, will consider action against a British agent provocateur and murderer, Mundt watches Fiedler with the calm of a hangman measuring his subject. Leamas then understands the trick. The defection has carried him into an institution where evidence and procedure can be turned against the people who believe they are directing events. Its decisive irony is that the trap depends on the adversary’s freedom to infer from the evidence, yet once that inference is made, the resulting judgment is no longer under Leamas’s control.

The episode joins the material fact of the divided border to the novel’s account of espionage as deception built from ordinary traces: a bank letter, a rumour, a public escape, an embassy’s facilities, a sequence of dates. None is conclusive in isolation. Together they become a story that can draw an opponent into action, but the same story also exposes the fragility of those who inhabit it. Leamas’s crossing is both the operation’s necessary proof and its point of no return.