Mundt’s recruitment by British Intelligence is the hidden arrangement behind the novel’s apparent campaign against him: the British recruited him after taking him prisoner in England, then protected his standing inside East German intelligence. The truth turns the accumulating clues about Operation Rolling Stone into evidence of a trap, and exposes the human cost of an operation built to preserve a valuable agent rather than deliver the justice its participants believe they are pursuing.

Recruitment and Return to Berlin

Fiedler’s account at the Tribunal begins with Mundt’s service in London. According to the case he presents, Mundt exposed himself to serious danger, fell foul of the British secret police, and became the subject of an arrest warrant. Without diplomatic immunity, he went into hiding as British authorities circulated his photograph and description and watched the country’s ports and transport routes. Two days later, despite that scrutiny, he took a taxi to London Airport and flew to Berlin. Fiedler argues that the ease of this escape makes British connivance more plausible than an extraordinary stroke of luck.

The explanation is that Mundt had been taken prisoner by the British and offered a choice: imprisonment and the end of his career, or a return to his own country under an arrangement to provide intelligence. British Intelligence promised substantial payments in return for information. Mundt accepted, and the apparent escape that restored him to East Germany was in fact the beginning of his work for the British. Recruitment therefore depended on a double appearance: to the authorities at home, he came back unexpectedly from danger; to his British handlers, he returned as a source whose career could be advanced and whose access could be exploited.

Building a Secret Channel

Fiedler describes the British as initially cautious about whether Mundt could be trusted. After his return to Germany in 1959, they waited for him to demonstrate his willingness to cooperate, gave instructions, and assessed what he reported against what they already knew. At first Mundt was not a senior figure in either the East German Service or the Party, but his position let him observe and pass on information. His early communications were handled independently of the British Berlin organisation; the British apparently met him in West Berlin or during short trips abroad, where they could contact and question him.

As confidence in the value of his reporting grew, the arrangement acquired its own restricted structure. Fiedler says that a small undercover section was established in London under Peter Guillam, with knowledge confined to a select circle within the Service. Mundt was paid through the special system called Operation Rolling Stone. The separation from the ordinary Berlin organisation made it possible for Alec Leamas, formerly head of its command, to deny knowing that Mundt was British-controlled without necessarily lying. The irony is essential: Leamas later handles money and intelligence connected to the operation, yet the channel’s compartmentalisation leaves its central source outside his understanding.

Riemeck, Evidence, and the Counter-Operation

Near the end of 1959, Fiedler says, Mundt told his London handlers that he had found an intermediary inside the Praesidium: Karl Riemeck. Riemeck could connect Mundt’s access to the British channel with information from within the East German leadership. When Leamas describes the intelligence supplied by Riemeck, Peters questions whether one man could have obtained so much and insists that he must have had high-level help. Leamas later recognises that Peters’s doubt echoes Control’s earlier questions about Riemeck’s access. The parallel points toward a protected collaborator, though Leamas does not yet know that Mundt is the source behind the intelligence.

The signs become more concrete in the financial evidence Fiedler presents. A Copenhagen account opened in the name Robert Lang held ten thousand dollars; a co-signatory withdrew the money a week after Leamas deposited it, on a date coinciding with Mundt’s visit to Denmark. Fiedler also links Leamas’s later deposit in Helsinki with Mundt’s clandestine journey to Finland shortly afterward. During the Tribunal, he returns to the restricted circulation of the Rolling Stone file, the letters to both banks, and the missing Helsinki reply. These details are presented as a pattern connecting Leamas’s movements and the payments to Mundt’s travel. In light of the recruitment, the financial trail does not simply implicate Leamas in selling intelligence: it helps reveal the covert mechanism by which the British serviced their agent.

That mechanism also changes the meaning of Mundt’s treatment of Riemeck. Fiedler argues that Riemeck fell under suspicion, and that the risk of exposure forced Mundt to order that he be shot if found, while enabling him to warn Riemeck to run. Fiedler further alleges that Mundt later assassinated Riemeck’s mistress. Mundt’s violence against people who might expose him is thus not evidence that he could not be a British agent; within Fiedler’s theory, it is part of the means by which the agent remained concealed. Fiedler also speculates that some Western agents were sacrificed so that Mundt could gain prestige by eliminating them, while acknowledging that this interpretation is an inference rather than something he can prove.

The Trap and Its Revelation

Fiedler’s prosecution turns the recruitment story against Mundt, but the apparent case against him has been engineered to protect him. When Leamas finally understands the trick, the carefully arranged evidence and his own staged role fall into a new pattern: the British operation has used his apparent defection and the campaign around Operation Rolling Stone to make Mundt’s enemy, Fiedler, vulnerable. The decisive result is not Mundt’s exposure but the removal of suspicion from a British agent whose position has become too valuable to risk.

After leaving custody, Leamas tells Liz what neither of them was meant to know: Mundt is London’s agent, recruited while in England, and the operation has been conducted to save him from Fiedler, who had begun to suspect the truth. Leamas says the British made them kill Fiedler. He then explains that Fiedler was too powerful for Mundt to eliminate on his own: merely removing him could leave accusations or witnesses behind, so the operation was designed to rehabilitate Mundt publicly and eliminate suspicion along with the man who posed the threat. The revelation recasts Leamas’s own apparent assault on a grocer and decline as parts of the assignment he had accepted, while showing that he had not understood its real purpose.

Significance

Mundt’s recruitment connects several strands that initially appear to contradict one another: his return from Britain, his advancement in the East German service, Operation Rolling Stone, Riemeck’s access to sensitive information, and the financial transfers traced through Copenhagen and Helsinki. Their force lies not in any single clue but in the way the revelation changes how those clues can be read. What looked like evidence that Leamas had betrayed his service becomes part of a controlled deception; what looked like a case against Mundt becomes a means of protecting him.

The episode also exposes the limits and moral cost of compartmentalised intelligence work. The restricted channel allows Mundt to serve the British without the knowledge of even a senior officer such as Leamas, but the same secrecy makes Leamas usable as an instrument in an operation whose purpose he has misunderstood. Fiedler’s suspicions are substantially right, yet the evidence that might establish the truth is folded into a scheme designed to discredit him. Recruitment is therefore not merely a concealed change of allegiance: it is the premise on which the novel’s wider reversals depend, and the reason the apparent success of the operation leaves its participants with no clean distinction between loyalty, betrayal, and sacrifice.