Diana Cowper visits a funeral home to arrange her own burial service with director Robert Cornwallis.

Hawthorne calls Anthony and proposes they co-write a book about the murder of Diana Cowper.

Anthony joins Hawthorne at Diana Cowper's crime scene to begin their investigation together.

Hawthorne connects Diana's final text about a 'lacerated' boy to the Godwin car accident tragedy.

Anthony and Hawthorne interview Damian Cowper, who dismisses the Godwins as the most likely suspects.

Anthony attends Diana's funeral after Hawthorne disrupts his screenplay meeting with Spielberg and Jackson.

A children's song plays from inside Diana's coffin during her burial, sending Damian into a fury.

Hawthorne has a sudden epiphany at the funeral wake and rushes Anthony to Damian's apartment.

Anthony and Hawthorne discover Damian Cowper's mutilated corpse at his London apartment.

Robert Cornwallis reveals a mysterious caller asked about the funeral schedule, identified as Alan Godwin.

Hawthorne stages a confrontation revealing Alan Godwin's affair with the family nanny caused the Godwin accident.

Grace Lovell reveals that Dan Roberts lost the lead role of Hamlet after falling ill during drama school.

Anthony visits RADA and recognizes Robert Cornwallis in a cast photo from the Hamlet production.

Cornwallis paralyzes Anthony and confesses he killed Diana to reach Damian and murdered Amanda Leigh years earlier.

Hawthorne bursts in to rescue Anthony; Cornwallis dies by suicide rather than be arrested.

The story begins when Diana Cowper visits a funeral home and is murdered that same day, prompting detective Hawthorne to recruit author Anthony as his chronicler. The two investigate Diana's past, including her connection to the Godwin family tragedy, and attend her funeral where a shocking prank inside the coffin exposes the killer's obsession. Their failure to act quickly enough allows Damian Cowper to be brutally murdered, deepening the case. A staged confrontation with Alan Godwin and the family nanny dismantles the Godwin revenge theory entirely, and Grace Lovell's account of drama school points to a new suspect. Anthony's solo investigation leads him directly into the killer's trap, and only Hawthorne's timely arrival prevents a third murder.

The headline events of the Cowper murder investigation.

Diana's body is discovered by her housecleaner days after her murder, initially dismissed as a burglary.

Anthony refuses Hawthorne's collaboration offer during their first café meeting.

A woman at the Hay-on-Wye literary festival challenges Anthony, saying his work lacks real-world grounding.

Detective Inspector Meadows cryptically warns Anthony to watch himself around Hawthorne, especially near stairs.

Anthony and Hawthorne interview Diana's housecleaner Andrea, who reveals a blackmail letter left at the house.

Hawthorne makes anti-gay remarks after leaving Raymond Clunes's home, causing Anthony to storm off in disgust.

Anthony and Hawthorne visit the bleak Godwin family home and interview Judith Godwin, who feels no sympathy for Diana.

Hawthorne interrupts Anthony's screenplay meeting with Steven Spielberg and Peter Jackson to drag him to the funeral.

At Diana's wake, the family lawyer reveals that Diana resigned from the Globe Theatre board on the day of her murder.

Anthony is forced to wear a pair of Damian's shoes after investigators confiscate his own at the crime scene.

Anthony secretly pays Meadows, who reveals Hawthorne was fired for injuring a pedophile in his custody.

Anthony and Hawthorne travel to Canterbury and interview Judge Nigel Weston, who angrily denies any conspiracy.

Hawthorne reveals that Diana's cat Mr. Tibbs was found alive at a neighbour's home.

Anthony discovers news articles about the mysterious disappearance of Amanda Leigh, a former RADA classmate of Damian's.

Anthony is briefly hospitalised after losing blood from Cornwallis's scalpel attack.

The investigation unfolds through a series of key encounters that reveal the world around Diana Cowper and the fractious partnership at the story's heart. Anthony initially refuses Hawthorne's offer but is swayed by a stranger at a literary festival, drawing him into a case far more dangerous than any he has invented. Interviews with Diana's acquaintances, her son's grieving partner, and hostile colleagues build a picture of a woman whose past carried real consequences. A secret meeting with the police detective assigned to the case gives Anthony disturbing information about Hawthorne's conduct, while journeys to Canterbury and Deal expose the true mechanics of the Godwin tragedy. The investigation climaxes when Anthony is hospitalised after confronting the killer alone, a consequence of his determination to outpace his partner.

The significant scenes and discoveries that shaped the investigation.

Anthony celebrates completing The House of Silk while weighing a new Tintin screenplay and his career direction.

Anthony calls Hawthorne back and accepts the collaboration offer after the literary festival encounter unsettles him.

Hawthorne notices a missing credit card at Diana's home and asks pointedly about the whereabouts of her missing cat.

Hawthorne declares that Diana Cowper knew she was going to die after their visit to the funeral home.

Raymond Clunes reveals that Diana had lost a significant sum of money in one of his failed theater productions.

Anthony decides to continue working with Hawthorne despite his bigotry, resolved to critique it openly in the book.

Anthony and Hawthorne meet Jeremy Godwin and are both visibly struck by the full tragedy of his condition.

Damian Cowper reveals during his interview that a mysterious witness fled the scene of the Godwin accident.

The Deal pharmacist recalls one of the injured twins crying out for his father, revealing the boys ran toward Alan Godwin.

Anthony confronts Hawthorne about his bias during the Weston interview; Hawthorne retorts he wished for a different author.

Hawthorne cryptically blames Anthony after Nigel Weston becomes the victim of an arson attack on his home.

Hawthorne explains in hospital that Diana had planned to die by suicide, making sense of her unusual funeral preparations.

Hawthorne reveals Diana's phone autocorrected the name Laertes to 'lacerated,' misdirecting suspicion toward the Godwins.

Anthony and Hawthorne reach a tentative truce and agree on the title The Word Is Murder at Hawthorne's apartment.

Anthony recognises a photograph at Hawthorne's home and realises Hawthorne's estranged wife was the woman who convinced him to join the case.

Beneath the surface of the murder investigation runs a deeper current of concealed information, personal reckonings, and pivotal choices. Anthony's decision to accept Hawthorne's offer sets everything in motion, and early clues at the crime scene hint at a killer with careful intent. The Godwin theory dominates the middle of the investigation before being systematically dismantled by a series of revelations about the family's real secrets. A mounting series of confrontations between the two investigators over Hawthorne's biases and methods drives Anthony to act alone, nearly costing him his life. Only in the hospital does Hawthorne finally explain the full truth, including Diana's hidden plans and the autocorrected text that sent them chasing the wrong lead for weeks. The final revelation at Hawthorne's apartment exposes the manipulation that started everything, leaving the partnership's future in doubt.