Having lost two agents in Berlin, British intelligence chiefs assign Quiller, George Segal to report to the local controller, Pol, and continue the mission to locate Phoenix, a neo-Nazi network.
Quiller leaves the Konigshof Hotel in West Berlin and confronts a man who has been tailing him, learning that it is his minder, Hengel, Peter Carsten. Hengel hands over the scant clues left by Quiller’s dead predecessor: a bowling alley ticket, a swimming pool ticket, and a newspaper clipping about a Nazi war criminal teaching at a school. Disguised as a reporter for the moment, Quiller visits the school mentioned in the article and is soon introduced to a teacher who speaks English, Inge Lindt, Senta Berger. After an interview, Quiller drives Inge to her flat and they stop for a drink, a brief episode that will entangle them further in the conspiracy.
As Quiller notices a man following him, he reveals his fluent German to throw him off, but danger is never far away. When he returns to his hotel, a porter bumps Quiller’s leg with a suitcase on the steps, and soon a sequence of pursuit unfolds: Quiller eludes Hengel, only to discover another car trailing him. The danger escalates as a drug injected by the hotel porter begins to take effect; he succumbs near a traffic stop, and the other car seizes the opportunity to abduct him.
Quiller wakes in a dilapidated mansion, surrounded by numerous shady figures who belong to Phoenix, the shadowy group led by the aristocratic code-named Oktober, Max von Sydow. A physician administers a truth serum, forcing Quiller to spill a few crumbs of information, though Oktober’s people press him only for what they believe he knows. The interrogation ends with Oktober deciding to spare Quiller’s life, reading him as a limited, if dangerous, asset rather than a mortal threat.
Cast back to the Spree by Berlin, Quiller finds himself by the river and steals a taxi to vanish into a nondescript, run-down hotel. He reaches out to Inge from there, revealing that he is an “investigator” chasing the neo-Nazi ring. The new relationship deepens when the two share a night of intimacy, and Inge discloses that a friend—who might have critical information about Phoenix—could be found through her network. That friend turns out to be Hassler, the swimming pool attendant, Hassler, Günter Meisner, who drives them to an old contact. The contact is revealed to be Inge’s headmistress, a figure who once helped betray a teacher from the article and points to a dilapidated Phoenix mansion, a clue that pushes Quiller toward the heart of the operation.
Determined, Quiller enters the mansion while Hassler and the headmistress leave a car nearby for him and Inge. Inside, Phoenix’s thugs close in, and Oktober unveils a plan: the organization intends to move its base the next day, and Inge has already been captured. Quiller must reveal the location of Phoenix before dawn to save her life. With the clock ticking, he is tailed through the streets by Oktober’s men; after a tense pursuit, he slips away again, making his way back to the hotel and then to a rear garage. There, he discovers a bomb strapped under his car; he rigs a detonation device that will trigger as the engine runs, then bolts over walls and into a safe stance outside the building. The blast leaves the thugs convinced the investigator is dead, a ruse that buys him time.
Arriving at Pol’s secret Berlin office, Quiller presents the coordinates of the Phoenix building, directing Pol to mount a strike on the organization. Pol sends a team to Phoenix’s HQ, successfully capturing the neo-Nazis there; however, there is no clear sign of Inge, a detail that leaves the outcome unsettled even as the operation appears to end.
Quiller returns to Inge’s school and confronts her in her classroom. She reminds him that she was lucky to be spared and notes that there was no answer from the emergency number he gave her. Quiller remains wary, convinced that not every member of the network has been rounded up, and he presses Inge to admit nothing. As he leaves, he wakes to a subtle, uneasy moment with the headmistress as she crosses paths in the corridor, hinting at the deeper secrets that still shadow Berlin’s post-crisis landscape.
