Griselda Fleet serves as the protagonist of the novel’s bureaucratic plotline, undertaking a significant transformation from a passive and compromised civil servant to an active and defiant agent. A dynamic, round character, she initially embodies the weariness of a career stalled by institutional inertia. Her complicity in the system is established early; she attends a lockdown-breaking party and is subsequently handpicked by Anthony Sparrow to be the “head canary” for the Monochrome inquiry, a role she accepts under duress to protect her job. Her vulnerability is compounded by severe financial strain resulting from her ex-husband’s gambling debts, which makes her susceptible to bribery. This leads to the central compromise of her character: She becomes “Toad,” a paid informant for de Vries, leaking information about the very inquiry she’s meant to lead. This duality defines her initial state as someone trapped between duty, desperation, and ethical decay.

The arrival of the OTIS file sparks Griselda’s transformation. Faced with genuine evidence of past wrongdoing by the Service, she begins to see the inquiry as more than a political game. When Monochrome is abruptly terminated via text message, Griselda recognizes it as a move by First Desk to bury the past. This moment pushes her from passive compliance to active rebellion. She uses a loophole in the inquiry’s charter to assume the role of acting president and continue the investigation in secret. This decision to “wag the dog” marks her evolution from a pawn into a player, one who’s willing to subvert the rules of the bureaucratic battlefield she once felt powerless within.

Griselda’s journey is one of reclaiming agency. Her motivations shift from self-preservation to a pursuit of justice, albeit a justice conducted outside official channels. Her final conversations with Malcolm reveal a deeper sense of disillusionment but also a newfound resolve. By choosing to hear the rest of Alison’s testimony, she commits to uncovering the truth of The Inescapable Weight of the Past, regardless of the personal or professional consequences. Her character arc demonstrates that even within a system characterized by moral compromise and political infighting, an individual can find the will to challenge the established order.

Max Janáček is the protagonist of the novel’s espionage-thriller plotline, a retired asset forced to confront his violent history. Known in his past life as Otis, Max is a classic reluctant hero archetype and a dynamic, round character whose quiet existence is shattered when assassins arrive at his Devon cottage. His character is inextricably tied to The Inescapable Weight of the Past; the life he has built as an early-retired academic is a carefully constructed cover designed to hide his role in a clandestine Berlin operation from decades prior. The sudden intrusion of violence forces him to shed his assumed persona and reawaken the dormant skills of his former profession.

Max’s resourcefulness is a key trait, highlighted during his escape through the Devon countryside. He uses his intimate knowledge of the local terrain, turning green lanes and crumbling garden walls into weapons and obstacles against his pursuers. In particular, he uses the “worst smell in the world” (15), that of the dead badger, as a tactical tool in his confrontation with the motorcycle rider. This act marks a thematic turning point: To survive the present, Max must embrace the rotting, uncomfortable truths of his past rather than run from them. His journey is a psychological re-engagement with the man he used to be, a person capable of calculated violence and ruthless survival tactics.

Max’s motivation evolves from simple survival to a determined search for answers. He understands that the attack’s roots lie in his time in Berlin. His quest to identify who hired his attackers leads him to reconnect with his old world, seeking out his former handler, Shelley, and tracking down her compromised replacement, Bachelor. This investigation shows his transition from prey back to hunter. Max’s journey illustrates that in the world of espionage, the past is never truly buried and can resurface at any moment to demand a violent reckoning.

Molly Doran, formerly known by her work name, Alison North, is the key witness whose testimony drives the novel’s central mystery. As the archivist at Regent’s Park, she’s the literal keeper of the Service’s secrets, a role that mirrors her personal status as the living repository of the truth behind the 1994 Berlin operation. A static and round character, her motivations remain consistent throughout the narrative: to force a reckoning for past crimes. The physical manifestation of this past is the loss of her legs, a result of the car bomb planted by Schenker. This permanent injury is a constant reminder of the brutal consequences of espionage and the violence of The Inescapable Weight of the Past.

As a young officer codenamed Alison, she’s sent to Berlin by Cartwright, ostensibly to conduct a compliance audit but secretly to gather intelligence on Miles. Her experience there, culminating in the explosion, shaped her into the cynical and determined woman she is in the present. Her decision to leak the OTIS file to the Monochrome inquiry is a calculated move designed to reopen a case the Service has long considered closed. By providing Malcolm with the file, she sets in motion the events that will ultimately expose de Vries as Schenker. This act demonstrates her strategic thinking and her refusal to let the crimes of the past remain unpunished.

Despite her trauma and cynicism, Molly operates with a quiet, unwavering purpose. During her testimony to the Monochrome panel, she’s composed and controlled, carefully narrating the events that led to the bombing. Even when the inquiry is abruptly shut down, she agrees to continue her testimony for Griselda and Malcolm, ensuring the full story is told and forcing the story toward its resolution. Molly ensures that the secret world’s violent debts are eventually paid.

Malcolm Kyle is a young, ambitious civil servant who is a supporting character and a foil to Griselda. Initially presented as a careerist, Malcolm is a round and dynamic character whose journey through the disillusioning world of the Monochrome inquiry forces a dramatic shift in his values. At the outset, he views his secondment to the panel as a promising career move. His character is defined by a deep-seated insecurity and a compulsive adherence to propriety and appearance, external signifiers of his desperate need for approval within the Whitehall system. His initial experience with First Desk, who neutralizes the inquiry on its first day, is a humiliating lesson in the realities of power, beginning his slow disillusionment with the system he aspires to master.

The anonymous delivery of the OTIS file into his shopping cart is the story’s inciting incident and Malcolm’s personal turning point. The arrival of the classified document forces him out of his passive role and into a state of crisis. His instinct is to follow protocol and return the file, a course of action encouraged by his former boss. However, the concurrent news that his career path back to his old department is blocked, and that he is being exiled to the provinces, shatters his faith in the system. This professional betrayal fuels his decision to rebel. He convinces Griselda that they should examine the file and pursue its leads, arguing that for the first time, Monochrome has become a real job. This marks his transformation from a self-interested functionary to someone willing to risk his career to pursue the truth.

Throughout the inquiry, Malcolm acts as a foil to Griselda. Where she is seasoned and weary, he is young and anxious. He initially harbors a faintly superior attitude toward her, but as the inquiry founders, they develop a relationship of shared disillusionment and, eventually, co-conspiracy. His journey illustrates the corrupting and frustrating nature of Bureaucracy as a Battlefield, but his ultimate choice to defy the system alongside Griselda suggests a capacity for integrity that was buried under his ambition.

Brinsley Miles is a key figure from the 1994 Berlin flashbacks, a cynical and manipulative spymaster who embodies the moral ambiguities of the Cold War’s aftermath. As portrayed in Alison’s testimony, Miles is a brilliant but deeply cynical operative, a perspective encapsulated in his grim assessment: “This job is about betrayal” (316). His primary motivation is revenge against Schenker, the man who murdered his asset. This personal vendetta drives him to run an off-the-books operation, using Service funds and his friend Otis as bait. His actions demonstrate the theme of The Corrupting Influence of Espionage, where personal motives blur with professional duties and ethics are sacrificed for operational ends. He’s a product of the chaotic Berlin environment, a world where the lines between right and wrong are constantly shifting. His background in this story offers context for the broader Slough House series, in which he is a primary figure and operates under the alias Jackson Lamb.

Fabian de Vries is the novel’s central antagonist, the ghost from the past whose actions connect the Berlin timeline to the present-day conflict. Originally Karl Schenker, a ruthless Stasi officer responsible for the murder of three women, he has successfully reinvented himself as de Vries, a wealthy and influential businessman. This transformation represents the idea that power and wealth can erase a violent history. In the present, his attempt to take over the UK’s vetting services through the Green Shoots Initiative poses a direct threat to national security. His decision to hunt down Otis reveals his ruthlessness in eliminating any loose threads from his former life. Herron frequently refers to Schenker as the “tiger” Miles and Otis hunted, reflecting his status as a predator who has seamlessly adapted to a new environment but remains just as dangerous.