Frank Jones, Michael Caine, is a retired British naval officer who now runs a small business. His bright but naive and idealistic son, Bob Jones, Nigel Havers, works as a linguist at GCHQ, the top-secret British intelligence listening station, translating intercepted conversations from behind the Iron Curtain. The story opens with footage of a Remembrance Day parade in Whitehall around 1985, where Queen Elizabeth II attends, and Frank watches from the crowd, medals gleaming. The narrative then shifts to a few months earlier, when Bob confides in his father about upheaval at GCHQ: there is strong evidence of a Soviet mole, and security culture pushes staff to report on one another to uncover the leak before American counterparts do. Bob also reveals that he plans to marry Cynthia Goodburn, Felicity Dean, who has a young daughter, a development that clearly unsettles Frank.
In a tense sequence set at a room in British Intelligence, Bruce, Gordon Jackson, and a colleague record their conversation. Frank receives a warning from his old Navy chum Greig, Barry Foster, now working with MI6, that any indiscretion on Bob’s part could ruin his business and draw scrutiny from the intelligence community. At their next meeting, which is covertly monitored, Bob tells his father he is about to reveal what he knows about illegal operations within his department and reaches out to investigative reporter Bill Pickett, Kenneth Colley.
Not long after, Frank is informed that Bob has died in a rooftop fall, with the official verdict leaving room for ambiguity—accidental death rather than foul play. Back at Bob’s flat, Frank is confronted by Pickett but declines to comment. In Bob’s pocket, Frank finds newspaper clippings—one about Cynthia’s husband, who allegedly committed suicide and was a colleague of the convicted spy Dodgson, Bill Wallis; the other concerns the death of Stephen Kedge, Dodgson’s friend, who allegedly fell under a train, a clue that raises wider questions about connections inside British intelligence. The name Dodgson anchors a thread that will pull Frank deeper into the mystery.
A subsequent meeting with Pickett ends abruptly when Pickett is killed in an elaborately staged traffic accident, while on his way to East Grinstead for a rendezvous with Bob’s contact and Frank. At Bob’s funeral, Frank is approached by Mark, James Simmons, a friend and fellow linguist who shares Bob’s world. Mark reveals that it was his Navy friend Greig who had grilled him about Bob’s loyalty, a detail that makes Frank suspect a larger scheme at play. He later gets Greig drunk and extracts a confession: Greig was at Bob’s flat the night of his death but did not kill him. His job, Greig admits, was to leave the door open for the rougher hands who would intervene. More damning, Greig names the mole as Sir Adrian Chapple, the figure at the heart of the conspiracy.
Leaving Greig in his intoxicated state, Frank is picked up by British Intelligence and taken to a country house where he is confronted by the Secretary to the Cabinet, David Langton, and a Lord, James Fox. They explain that Bob had been out of control and that his death was staged to protect a larger plan designed to mislead the Americans about the depth of Russian intelligence inside British operations, thereby preserving access to intelligence from the CIA. They concede Chapple will remain in place for now, while they assess the damage and plan their next moves. They warn Frank that going public could put him, Cynthia, and her daughter in physical danger, a threat that haunts him as he weighs his choices.
The film returns to the present-day Remembrance Day parade, where Frank makes a bold move. He approaches Chapple’s Whitehall residence, only to be admitted after being mistaken for a charity collector. Inside, Chapple finally admits to spying for Russia, and Frank demands a full confession. Chapple dutifully writes one, but when Frank reads it, Chapple draws a gun and demands the return of the document. In a tense struggle, Frank wrests the weapon from Chapple, the shot ringing out and killing Chapple. He leaves behind the signed confession, which reads like a suicide note, and, with the crowd marching by, Frank returns to the parade, joining the marchers as if nothing had changed—a quiet, morally complicated ending that underscores the price of truth and the cost of loyalty in a world where spycraft and politics intertwine.
