Cormoran is a war veteran turned private detective working out of a small office in London. He experiences constant physical pain from a prosthetic leg and psychological trauma from his past, yet maintains a highly observant and analytical approach to his work. Despite gaining recent fame from the Lula Landry case, he takes on Leonora Quine's low-paying request out of a stubborn commitment to principle over profit.

Robin serves as Strike's assistant but quietly aspires to become a full-fledged investigator. She manages the agency's daily operations while expanding her fieldwork capabilities, such as taking advanced driving classes. Her professional ambitions cause significant friction in her personal life, forcing her to perform constant emotional labor to appease the men around her.

Owen is a once-promising, highly egotistical author who vanishes after submitting a controversial manuscript titled Bombyx Mori. He deliberately cultivates a provocative public image, complete with theatrical clothing and a habit of instigating public feuds. His professional and personal circles are filled with people he has alienated through years of narcissism and bitter rivalries.

Leonora is Owen Quine's plain-spoken, working-class wife who hires Strike to locate him. She presents a flat emotional affect and a lack of social artifice that causes others to misinterpret her intentions and immediately suspect her of wrongdoing. Her primary focus remains the care and protection of her daughter, keeping her isolated from the glittering literary circles her husband frequents.

Orlando is the daughter of Owen and Leonora Quine and lives with a developmental disability. Others frequently ignore or talk over her, assuming she does not understand the complexities of the adult world around her. She quietly observes the people visiting her father's office and occasionally makes blunt statements that cut through the social performances of the literary elite.

Elizabeth operates as Owen Quine's longtime literary agent. She suffers from throat cancer that causes a persistent cough, matching her generally bitter and defensive demeanor. Once an aspiring writer herself, she now manages the careers and fragile egos of male authors, holding deep resentment over the trajectory of her professional life in the publishing industry.

Michael is a famous, highly successful novelist and a longtime rival of Owen Quine. He maintains a polished, intellectual public persona that carefully guards his private grief over the suicide of his first wife. He frequently speaks in literary abstractions, positioning himself above the petty squabbles of the publishing industry while quietly harboring deep resentments.

Matthew is Robin's fiancé, a man with traditional expectations who works as an auditor. He exhibits severe insecurity regarding Robin's dedication to her investigative career and views Strike with overt hostility. He demands continuous emotional reassurance and prioritization, creating a constant source of friction in Robin's professional development.

Kathryn is a failed writer and Owen Quine's former mistress. She maintains an emotionally charged blog where she frequently posts cryptic updates about her volatile relationship with the author. Her public aggression masks profound insecurity and a deep emotional connection to Quine's destructive personal orbit.

Pippa is a young, aspiring writer who received mentorship from Owen Quine. She is fiercely protective of her connection to the author and views other women in his life with intense jealousy. She acts impulsively out of a desire to defend her mentor and secure her place in the literary world.

Daniel is an executive at the Roper Chard publishing house. He lives in a grand country home in Devon and relies on crutches due to a physical disability. He operates with extreme formality and elitism, frequently ignoring those he considers beneath his social or professional standing.

Jerry is Owen Quine's former editor, a man currently spiraling into severe alcohol addiction as his personal and professional lives collapse. He frequently acts as a buffer between Quine's difficult behavior and the publishing house, absorbing the emotional fallout of the author's ego. The stress of the missing manuscript pushes him toward total emotional breakdown.

Christian is a smart, provocative publisher who operates on the fringes of Quine's primary circle. He enjoys the chaotic gossip generated by the leaked manuscript and eagerly shares details of its scandalous contents with industry insiders.

Nina is an editor at Roper Chard who provides Strike with crucial insider access to the literary world. She possesses extensive knowledge of industry rumors and helps Strike identify the real-life inspirations behind the grotesque characters in Quine's writing.

Richard is a detective with the Metropolitan Police and an old army friend of Strike. While he owes his life to Strike, he frequently dismisses the private investigator's literary theories about the case, preferring to rely on conventional assumptions and surface-level evidence.

Charlotte is Strike's volatile ex-fiancée who recently ended their long, obsessive relationship to marry an aristocratic man. Though she does not appear physically in the main action, her memory constantly disrupts Strike's emotional stability, representing the kind of manipulative performance he now actively avoids.

Al is Strike's estranged half-brother, sharing the same famous musician father. He lives a life of relative privilege but expresses a vague envy of Strike's rugged independence, occasionally using his high-society connections to assist his brother's investigations.