David Hunter—Mackenzie

David Hunter’s working relationship with Mackenzie is the investigation’s practical bridge between forensic evidence and police inquiry. Mackenzie brings Hunter into the case for his expertise, and their cooperation repeatedly turns physical traces into investigative leads. Yet it is not a simple transfer of answers: Hunter questions what the evidence can establish, while Mackenzie’s assumptions about his continued involvement sometimes run ahead of Hunter’s consent. Their partnership is most revealing when a clue changes meaning and both men must revise what they think they know.

A partnership formed through the investigation

When Mackenzie reports that no one has seen Sally Palmer since the pub barbecue, he describes a disappearance that had gone largely unnoticed. Sally failed to collect a grocery order and stopped picking up her daily newspaper, but no one had reported her missing. Mackenzie tells Hunter that serious inquiries have begun to find her. The exchange places Hunter alongside the police investigation, while also exposing the limits of the close-knit community Mackenzie is trying to search: Sally’s absence has been mistaken for a change in her own plans rather than recognized as a warning.

The collaboration becomes more explicitly forensic when test results establish that Sally had been dead for around nine days when her body was found. As the third day since Lyn Metcalf’s disappearance passes, Mackenzie and Hunter recognize the urgency of finding her before the apparent timetable of the killer’s actions runs out. Hunter then gives Mackenzie the analysis of material found in a knife mark on Sally’s vertebra: it is bitumen, a common substance available from hardware and do-it-yourself stores. The result is precise, but not yet identifying. Hunter still needs to examine the marks on a dog’s spine before he can say whether the same weapon killed both victims.

Evidence, uncertainty, and competing interpretations

Hunter’s value to Mackenzie lies not only in producing results but in defining their limits. When they compare a rough cut in bone with the smooth mark on Sally’s vertebra, Hunter points out that the rough cut has left ridges and that the earlier assessment associated that pattern with a serrated blade. The difference does not settle what happened; it makes a simple identification of the weapon harder. Their exchange shows the investigation as a process of testing whether separate marks belong to one explanation, rather than treating resemblance as proof.

Mackenzie also brings Hunter a witness’s account that Sally had been upset by a dead stoat left on her doorstep. Hunter connects that report with the swan wings found with Sally’s body and the mallard tied to a stone on the morning Lyn disappeared. Mackenzie considers several possibilities: the animal could have been left as a prank, or it could have served as a warning or marker. He notes that birds already appear to function as the killer’s signature, while leaving open the possibility that other animals are part of the pattern. The clue matters to their relationship because Hunter supplies the connection between separate incidents, while Mackenzie frames it as a hypothesis rather than a settled conclusion.

A cooperative role that is not automatic

Mackenzie’s reliance on Hunter becomes clear when he asks him to come to the lab after the body is ready for examination. Hunter asks why, objecting to the assumption that he will simply get involved. Mackenzie’s surprise at the question, and his expectation that Hunter will attend, reveal how routine their cooperation has become. The exchange conveys trust in Hunter’s expertise, but also a mild friction over the boundaries of that work: Mackenzie treats his participation as part of the investigation’s expected course, whereas Hunter retains the right to decide whether to take it on.

Their collaboration extends beyond examination of remains. After finding an article about Sally in a local parish newsletter, Hunter phones Mackenzie, who comes to read it. The article’s contents are not sufficient here to establish what either man concludes, but Hunter’s reaction makes clear that it has unsettled him and that he considers it important enough to share. He then raises another line of inquiry: Lyn and her husband, Marcus, had been trying to start a family and were considering fertility treatment. By bringing the couple’s medical history to Mackenzie, Hunter contributes context that a physical examination alone cannot provide. The partnership thus joins forensic findings with information about the victims’ lives, without making that context a conclusion in itself.

Independent judgment and the limits of certainty

The strongest test of their working relationship comes when Hunter encounters bitumen again while investigating a house. He finds black smears on a doorframe and newspaper coated with the same sticky material; he recognizes the substance as bitumen and recalls that the bedroom had been sealed to mask the smell of an elderly man’s body. The association recalls the bitumen embedded in a dead woman’s neck. Hunter immediately understands the possible significance, but he also checks his own certainty: only minutes earlier he had been convinced that Carl Brenner was the killer, and now he is considering Tom Mason instead.

Hunter tries to call Mackenzie, but there is no mobile reception. Although Mackenzie needs to hear what he has found, Hunter will not leave before checking that Jenny Hammond is not in the house. He searches the rooms, finds no sign of her or a telephone, and then tries his phone again from the vehicle. This sequence defines the partnership without making Hunter merely Mackenzie’s informant: he recognizes the importance of passing on a clue, but acts independently when the immediate safety of another person takes priority. Their collaboration depends on Hunter’s specialized reading of evidence and Mackenzie’s investigative role, while the shifting suspects and incomplete leads keep every shared conclusion open to revision.