At Borough Market in London, a large truck is seen maneuvering through the bustling vendors despite their protests, only to explode dramatically. The ramifications lead Scotland Yard to raid a storage garage, where they uncover the chemicals used to create the bomb, arresting the garage's owner in front of his terrified wife and their 14-year-old child. As the case unfolds, it becomes apparent that a private hearing will determine what evidence can be presented to the public, with potential implications for ongoing terrorism investigations.
At a funeral for a barrister named Simon, we learn that he was set to defend the terrorist but instead took his own life. Taking his place is Martin Rose, portrayed by Eric Bana, who is grappling with the fallout of a recent divorce after his affair with Claudia Simmons-Howe. Now representing the terrorist's interests, Claudia and Martin must avoid contact after confidential government information is shared with her.
As Martin navigates this treacherous landscape, a reporter from the New York Times hints that Simon's death wasn’t a straightforward case of suicide. He starts connecting the dots: the terrorist had an extensive history, was previously arrested in Germany, and had suspicious ties to the garage rental before the bombing.
Their paths cross again at a clandestine meeting, where Martin voices his concerns about the established narrative and persuades Claudia not to divulge their findings during the private trial, hoping to reveal everything publicly. However, as the trial progresses, Claudia confronts Melissa, an MI5 witness, who deflects questions about a covert operation that may have gone awry—complicating their case even further.
The tension escalates when the Attorney General, played by Jim Broadbent, warns Martin to tread carefully, hinting at looming threats tied to his past relationship with Claudia. Adding to Martin’s stress, a shocking newspaper headline reveals the death of the journalist he met with, pushing him deeper into a web of intrigue and danger.
An attempt on Claudia’s life prompts them to discover the terrorist’s son, who holds vital information that could expose MI5's involvement. They manage to get him to safety, but as they head to court, a grim fate befalls the terrorist—he is found dead in his cell, an apparent suicide that comes just before critical evidence can be shared.
Three months later, the fallout continues as the Attorney General faces accusations of orchestrating a cover-up, suggesting that the truth may eventually surface despite all attempts at silence and manipulation. The narrative weaves a tale of betrayal, conspiracy, and the relentless pursuit of justice amid a landscape riddled with secrets.
